I have a 2001 half ton Chevy Silverado with a 6" lift, a rear 4:75 gear ratio riding on 35's and my stock transmission has given up on me.

I am looking at this transmission/shop for a replacement, but before I do I want some advice from my fellow members.

Here's the transmission that I am thinking of getting:

And the name of the shop is Monster Transmission and Performance.
Has anyone heard of this shop and/or know if their rebuilt performance transmissions are good?

They seem to have some pretty good review, however I would like some advice or see if there's any other recommended shop other than this one.