I got a Pre the day it came out (showed up at 6am at
Best Buy to stand in line). I love it so far. I upgraded from a centro. I'm not a huge "techie", and don't use my phone for high productivity tasks (read: business), and it works great for me. There are some people who are not as in love with it because they are heavy business users, and apparently it's missing some features that made previous palm devices perfect for business users.
If you have any specific questions about it, feel free to ask! Also, there are some great forums that have TONS of info about the Pre.... precentral.net and everythingpre.com.