Does anyone have any experience with these guys.

I need to get my upper rebuilt and I want a good shop to do the upgrade on my Bravo 1

They offer a two year warranty.

http://www.allamericandriveservice.com/index.html

i have heard nothing but good about them

I have a rebuilt drive from them. Just finishing the break in, but so far so good.

My buddy has been using them. He seems very happy with them