Oddly enough, and I'm surprised by this. I have never in my life seen a G1. Also, similar to the Storm - If I were a T-Mobile customer I would own one, but the iPhone is just better.
If I were a T-Mobile customer I would get some free crap phone, buy an unlocked iPhone, and then put the sim card in there.
Tada! I've now avoided misery from owning a G1.
That has to be one of the worst "iPhone killers" out there.