Well, it's hard to say as it's been less than a day. The best thing about it is that, so far, everything just works. Nothing funky or strange has happened with it. The other best thing is that it's fast.
With some of the other roms, the touch keyboard sometimes had this sluggishness to it where you type ahead of the text showing up. Not so with PE (so far anyway). Screen transitions are fast, widgets haven't randomly stopped working, no redraws on the homescreen, no random FC's, basically no problems so far.
Going back to speed, it immediately felt faster than UD3.0 did.
So far, so good.
Edit2: Someone reported the "no data after call" issue, I haven't had that problem with any of the GB roms. According to the PE dev, their rom doesn't have this problem and suggest that it may be due to a bad download or something else.
Edit: additional info
Some of the random problems with a few of the other Gingerbread roms I've tried: apps starting at random, gallery problems (requiring battery pull), random hot reboot, weird text messaging errors. These were infrequent, but they were still there.
Random cool thing that I have not seen in other roms: previews of bootanimations that you can then choose to install.
Screenshots of "Elite Options"
Most of it is the usual stuff.