New Transformer user here. I had a Kindle Fire until recently (sold it on eBay) and tried a few ICS builds after rooting the tablet. Sure, ICS worked on it, but the video in the OP definitely doesn't tell the whole story. Stability certainly was a problem: I experienced many FCs and a lot of tablet-specific apps just wouldn't run properly on it.
Devs (as usual) are (still) doing great work to make the KF a nice entry-level tablet, and for the price, you won't find a better deal (especially if you are willing to buy a used or refurb model). The KF community at XDA is VERY responsive, which is a definite plus. However, I just didn't find it as fast as when I was using the stock ROM or alternate GB-based ROMs available for the KF (Hellfire's builds were really good). Without the availability of a 3.x kernel offering full HWA (I know devs are working on this), performance wasn't that great, especially after I loaded up the tablet with 60-70 apps I typically use on my phone.
I parted with the KF mainly because I found its screen size too small (I've developed a taste for reading magazines and the like). At the end of the day, I was willing to sacrifice portability for more screen estate, as well as better storage options and support for future Android updates. Time will tell if I made the right choice.
---------- Post added at 09:00 PM ---------- Previous post was at 08:51 PM ----------
Sony do very nice e-readers, the Kobo are the same price as the kindles, and both support the superior EPUB format.
I've used all three, and frankly, the best e-reader I owned was (by far) the Kindle 3 keyboard. If you know what you are doing, you can convert books in the proper format (using something like Calibre) or use a third-party ROM to read .epub files on it natively, so file format wasn't an issue for me. Amazon's online selection is top notch, way better than anyone else out there including Barnes and Noble, Chapters, etc.
The Kobo Touch was a close second, but had a lot of firmware issues: the last version I used before giving mine away seemed to fix most of them (especially the highly annoying page turning bug that crept up at some point). The hardware is nice though, I wouldn't hesitate to recommend one.
The Sony e-reader was just garbage, I had to return it twice after both units died on me. I will never buy any other e-reader from the company.