RavenFox
Android Enthusiast
The Atrix will be using HSPA+ on AT&T's network. Technically, that isn't 4G. At best, you could really only call it 3.5G. AT&T will come out with a true 4g network, LTE, later at the end of this year. The phones coming out then that take advantage of LTE will blow away the Atrix.
Do some research on HSPA+ before you post. Also good luck getting true LTE speed.