I just ordered one, then heard a tale of woe from a fellow club member at our indoor flying session this weekend. He said his had a very poor fit and had to shimmed out with tape, and he experienced servo jittering that he couldn't fix. He returned the module and it was replaced with another (and another receiver). The new module had the same issues with either receiver.
The Tx continues to function perfectly with the Futaba module in place. He is a very experienced and skilled builder and pilot. All settings were checked and re-checked and the instructions followed carefully.
I did some web searching and couldn't turn up anything similar, so I'm hoping it was an isolated incident. Mine is due to arrive tomorrow so I'll get some first-hand experience soon.
Good flying, desmobob