I upgraded just for the sake of being on the latest, and I realized that with the first GM, my battery was dropping FAST. I didn't really realize it until I installed GM2. Also, I wasn't having any issues with wifi on GM1.
I know there were a couple of threads concerning this, and I didn't realize I was affected until after installing GM2.
Granted I've been using my iPad lightly the past 24 hours, but in that time, I'm only down to 98% battery. I'm glad I did the update.