After reading HarryT's review of the new Gen3 I had to get one too! I have had the original Gen3 since Christmas and loved it, except for the Nav Button which tended to be a bit loud. The center "Enter" button once woke Hubby up.
I LOVE the new Gen3, the Nav Button is very soft and responsive, the center "Enter" button is a very soft click. It came with firware 1.0 build 674 and I haven't bothered to upgrade it yet. My files all seem to work well, I haven't put any new PDF files on, but the demo ones work well. I haven't had any problems with bookmarks that others have mentioned, but then I didn't have any trouble with bookmarks on the original Gen3 either.
Hubby is trying out my original Gen3 to see if he wants one. If he likes it I'll likely order a new one and sell the original on in the "Flea Market." Is anyone interested?