The achievements are already quite stunning for such an early release. As already stated, GPS hardware works and it's possible to get a lock on your position, but it takes a very long time. But this is of lesser importance.
Another thing I wanted to add to my "doesn't work" list is, that H/W decoding of video material is broken. Again, not really that important ^^
Keep it up, tgascoigne! Awesome work so far!
My Android History:
Motorola Milestone > HTC Desire Z > HTC Desire HD > LG Optimus Speed > Samsung Galaxy S II > HTC One X > Samsung Galaxy S III
> Google Nexus 4 > HTC One