Well let me rephrase. I would say 1.1 is the "snappiest" but both 1.1 and 1.5 are in my opinion equally as stable. The 1.5 builds bog down some times but it really doesn't bother me. The portrait keyboard alone is worth the upgrade.

As for GPS, it is indeed working. I just tried it out. It takes a few tries to start it up (think of it like an old car trying to start on the cold morning. It takes some time but once it's running it works great), but it works great after that. In the next day or two i'de like to drive around with it enabled to see if it will stay locked on.