I just recently switched. I decided to go with the Dinc2 and I'm happy with it so far. The speed is much better than the Fascinate, The screen is really good, I compared the Fascinate side by side and there wasn't much difference, the Dinc2 has a really good display.
I'm happy to have a phone that works!!
My only complaint is the Sense UI. I have a love/hate relationship with it. Some things I really like and some I don't. The photo gallery sucks, I prefer the Android stock gallery that I can sync with Picasa. Now I had to download the "Picasa Tool" app to manage my albums. I do like the mail application on Sense UI, the layout is really nice. I also like that the phone has Gingerbread on it as well.
The Fascinate was a good phone, the sad part is that the developers on this forum put out better ROMS for it than Verizon/Samsung could. Verizon and Samsung have teams of people working ont these things and the developers on this forum create these ROMS as a hobby in their spare time, makes you wonder......:-$