Sampson Airline 77, or?

I've been searching through the discussions of wireless systems and the Sampson Air 77 seems to be the best deal, for the money.

The other one I'm also thinking about is the AMT Wi5, except it's more than twice as much money.

Am I missing anything? Does quality justify the extra cost of the AMT? I'll mostly be using it on stage, but if the AMT is a good studio solution that might effect my decision. Does a wireless set-up put compression on the signal? I'm also assuming both these units meet FCC reg's.

Thanks, I'm about ready to pull the trigger on something.