Good to hear this, I just ordered one as well for the same replacement. I do really like the xbox controller, but overall the package is pretty heavy with the phone in a Moga clip.
I wanted the Gamevice Flex, and was hoping for a restock and a sale on prime day but after checking their Twitter it doesn't seem likely to have stock soon. The ergonomics on that one seem like they might be superior for larger hands on longer play sessions, but I'm hoping the x2 pro is okay.
This all became relevant after I discovered how great emulation is on Android. I was on a business trip for a week and enjoyed playing ocarina of time 3ds and castlevania. Someone put out a native port of hollow knight that I just got 100% progress, and there's so much more to play. Haven't even gotten to streaming from my PC or Xbox cloud yet.