4G is great when it's allowed to go full speed ahead. Sadly though AT&T haven't allowed this to happen at present with data speed caps and a promised update that seems to be seeming ever less likely to be released as promised in April.
Thankfully though the wonderful people over at XDA Developers have come to the rescue. If you have a rooted Motorola Atrix or need a reason to root then follow the link and enjoy. The mod itself is the radio ripped from Telstra's 1.4.2 update. A note of warning though as the topic starter does say this has not been thoroughly tested and there is the slight possibility it could wreck your phone
If any of our readers have tried this then hit the comments to let us know how it went.