This wonderful Tablet was also sold on Amazon in a Black & White attire, which is the one I bought about a month ago. You can find additional useful reviews there as well (use your favorite search engine look for T91MT-PU17-WT, because amazon.com only sells the all-Black one now).
Another very informative source of info about the T91MT is: http://myt91.info/

My personal learning experience with this Tablet was very satisfying . After using it for extended periods of time over the 4-day long Thanksgiving weekend, and then on my daily commute and at the office for occasional use, it easily fulfilled all of my expectations:

1. Reading any size of PDF files was a breeze. Acrobat 9 ran quickly on the T91MT. The ability to rotate the screen by pressing a button on the frame lets you chose portrait or landscape. Although it's a nice to have, I found it most useful in just reading everything in the default landscape-mode.

2. Internet use was as fast as on my dependable desktop. Both PCs access the Internet via wi-fi and downloads to the T91MT were even a bit faster than what I get on the desktop. (600 kB/sec from fast servers).
As much as I liked using Google's Chrome to browse the Inernet for over a year now, I found the Microsoft browser to be a lot better suited for a multi-touch screen. The scrolling of pages is quick to respond, and zooming is quick too (either sweesh two fingers away or toward each other, or hold one finger steady and tap with the other). The zooming on the browser only happens in some increment, and I wish it was continuous, but it still served its purpose in getting the fonts/photos to a comforable size (however I am still looking for some tweak to make it zoom to precisely where I want it to be). Some applications do support continiius zoom.
Proper usage of 'flicks' - sweeping a finger right or left will take you back or forward on the internet pages.

3. Watching videos: Whether watching a full feature film or a video clip played from a file on the local Drive, or streaming Youtube in regular or HD resolution, the Picture was smooth and nearly always jitter free. An episode of a TV Series which I played with a "VLC player" was jumpy, but once I switched to Windows Media player, the picture was smooth again.

4. Power levels: the T91Mt has several power levels. Should the video not run smoothly, or any other action not be fairly fast, it may be an indication that it is in 'power-saver' mode. To bring it back to higher power usage, simply click on the small battery icon on the the toolbar and select 'high power'.

5. Battery: with declared battery life of of 5 hours, I initially carried the charger with me to the office and back, but soon enough realized it was not necessary in my case. The t91mt still serves me for a full day's use due to realizing that I use it as one would use his cell. When needed, it comes out of 'sleep-mode' in only 3 seconds (!), ready with Internet pages and ofher forms just as I left them, and goes back to sleep instatly at the slide of a button. After repeat casual use during a full day of 5-10 minutes at a time, there is still 2+ hours of life in the battery to last me the 45 min commute back home. You can also improve on battery life by turning off un-used blueooth and other devices if you have no need for them, or keep the screen brigtness at just the right level or do other tweaks easily with ths provided power options.

7. CPU: If you are looking for a powerhouse of a multi-tasking-supporting machine that can play demanding games, then this machine (and most availale netbooks probably) are not for you. For daily use of Internet, Music playing, eReading, and other common activities, the t91mt does a great job.

8. Sound/Equalizer: You cannot expect too much from the small standard speakers on the t91mt, so the sound quality is fair. It gets far better with headphones or a good set of PC speakers where the soundcard does a great job. Both streaming audio from Pandora and mp3 on the local disk sounded great.

9. Booting / Other Comments: The initial booting+setup took ~15 min but was without any glitches. Just hang with it and reply to the prompts. Setting up the Wifi Connection was very fast. Windows 7 may be Vista based but is a pleasure to work with. Many functions are intuitive. To me it seems like Windows has really matured. Because the machine has no moving parts(except for maybe a tiny fan on the CPU?) it hardly gets warm, and is totally silent. (you can also selct 'active/passive' cooling from the power-schemes menu).

Final thoughts:
I was aware of this tablet coming out already 9 months ago, and the wait was well worth it. Asus has created a Well rounded and refined product with attention to detail, from a well laid out keyboard to a nice suite of software. I did not find any need for the Asus Gate utility and some people chose to uninstall it altogether. I exclusively used the excellent virtual keyboard, and the so easy to use stylus & notepad to write this review. It makes writing so much more 'natural'.

If you had in mind to buy any extras for the T91MT, then depending on your needs, instead of an upgrade to 2GB you may chose to go for an additional Memory Card simply because the T91MT comes with a 32 GB card but about 12 GB are taken by the system + programs software.
As with any sophisticated device, it may take a little getting used to. The T91MT normally runs fast and the display is responsive, bright and sharp. If any of these parameters are not quite so, set it to use the 'high power' scheme or find what runaway proceses may be hogging te resources.

Some reviewers take issue with 'palm rejection' but with a screen only 9" across I find my hand rests on the frame and not leaving an impression on the notepad, hence did not see a problem there-but that may be a personal take.
Initially I though I would wait for the 10" T101 by Asus, but the 9" is light & more compact and was a good choice to take anywhere especially when my daily commute requires the use of public transportation.
Day to day use also shows me that this machine is much more practical than a 'flat screen only' Tablets (which do not have a real keyboard), because you can position the screen at any angle you want it on your lap or on a desk. The hinge is VERY Solid & stays in place exactly the where you want it.

After a month of use, this tablet pretty much put my desktop 'out of work'. I am now going to use my desktop as a part of my entertainment center, by connecting the TV to the PC and Internet via its wifi, not to mention using the deskop as a replacemet for the DVD p,ayer taking advantage of fhe hdmj output from the video card.
The welcome arrival of the T91MT was indeed a game changer in more than one way for me.