Since I couldn't really use the G1, I won't rate it--and I wouldn't buy it, either. I'll wait for Apple to open up the iPhone (no hacker, I).
UPDATE: A reader comments...
I have a G1 On loan from T-Mobile. I like it. The GPS works great. The
browser loads faster than the iPhone. And it's cheaper! Someone I Know has
an iPhone, and it's nice too. To undeerstand what it's all about, read this
article in Wired: