I also tried MIUI yesterday, pretty much prompted by a posting by Miffed. But I didn't like it very quickly and, using the same Clockwork ROM Manager as Miffed I restored my Cyanogen installation and went back to normality.

The newest MIUI is 1.9.2, updating from 1.9.16. It did seem quite stable for the short time I used it. When first installing you do need to reboot several times to allow MIUI to set up the correct language menus, and by default it did not start up the 3 APN or WiFi.

But for me, a significant negative for MIUI was its iPhone layout I do like Android, vanilla, and it did seem a bit perverse to convert my Android into an iPhone.

I was also irritated that MIUI did not restore all of my Android apps - it found ten of them that required me to install them manually, but the remaining apps were not discovered and I had to then try and recall what I was missing. Contrast that with CM7 which took all of about 15 minutes to install all of my apps from the Google cloud.