I too, had the issue with hot rebooting when turning on wifi. Also, I had absolutely no data working, even though the phone info would indicate that I did have a data connection/
Other than that, I was actually damn impressed that it still ran as well as it did. I've really been wanting MIUI on the Droid 4 as well, and this was actually the smoothest MIUI port I've ever used on a device as far as scrolling around and such went. Please, keep up the great work and continue developing this. You have all of our support.