I tried to look and see what version of "Play Store" I have but don't know how to do it. I just use this app and everything works. Apart from the auto update when I first tried to use it I have done nothing.
The market fix gives acces to a lot more apps than you would otherwise have acces to but there will still be some that are still not compatible. Some of these will actually work if you can get your hands on the app elsewhere e.g. ITV Player. Equally others wont e.g. high end games.