I'm curious what other ebook readers you're looking at. So far, I've used a Foxit eBook reader, Sony PRS-700, kindle, iPhone and various computers.
The Foxit totally sucks. It's got a nice formfactor, but it's slow and difficult to read PDFs without having the text get wrapped and lose all spacing (sometimeswordsgetjumbledtogetherlikethis).
The Sony reader is pretty good except that the glare totally sucks and when reading PDFs, it's only got pre-set zoom levels; no fit-to-width, so the text is constantly either too small or it's the right size, but wraps all over the place.
I was waiting for the PlasticLogic to come out (something like mid 2010, last I heard). It's a good size, so PDFs will render well and it seems fast and very sturdy.
I haven't had a chance to check out any ePub books, yet, but I've heard good things. The only problem is that Amazon has a HUGE selection of eBooks for the kindle and ePub doesn't have that many commercial books; at least, I was only able to find 1 book I wanted in ePub format and 2 or 3 in PDF format.
Considering that books from O'Reilly, Pragmatic Programmers and other tech publishers are available only in PDF (since the kindle format doesn't support fonts for code snippets), I feel like the new KindleDX is the perfect solution--not only does it allow me to buy the most widely available eBook format but it also allows me to read PDFs on an acceptably large screen.
I tried to hold off, but I HAD to preorder the KindleDX... I'm a little concerned that it's not gonna be as good as I hope, but I think it'll be a good purchase in the longrun. I really hope that amazon/publishers come to their senses and stop with this garbage of disabling TTS or other features.