I just got mine as well today. I hurried to order it from NCIX.com when I saw that the SonyStyle.ca store was out of stock. As a canadian, I've got to say that we get a horrible deal. The reader sells for $399 CAD, and the CAD has been worth over 90 cents USD for a long time now. So it's kind of a rip-off. Oh well, at least I got it from NCIX at $389, and I don't have to pay the Quebec sales tax ($415 with taxes). Still, pretty expensive.
So far I like it, but the screen has a bit of glare. It might take a while to get used to, after owning the 505 for so long. I bought this one because the substrate on my PRS-505 got damaged while it was in my bag.
Aside from the glare, I really like it. The dictionary is very nice, and is it just me, but the screen refresh is a bit faster than on the 505? It seems to take less time to switch menus and turn pages.
Anyway, I'm gonna go play with it some more now...
Edit: oh yeah, and the M-Edge executive cover that I used for my PRS-505 also fits the PRS-600, so that was also a nice point!