I just got my Epic Touch 4g to replace my EVO3D. Must say that I am very impressed with this phone. Though is will feel super light for me at first coming from the heavy and thick evo 3d, but you will get used to it. The phone's camera, speaker, and screen blow away my 3D. It is nice and thin, looks better. As far as performance goes, so far I have not been able to push it, and to see how it performs once I have all my apps and crap on it. But so far it feels snappy.
I just love the screen size. I have never had an issue with the size of the screens these days, but anything bigger will probably be obnoxious, and this might suck for some with smaller hands, but I love it.
Someone above mentioned the resolution. I was worried about that, but the screen on the Epic still looks better to me.