I had the Non-3G dash and did not like it.
I have the Blackberry 8900 now, much better smartphone, IMO. It's not 3G, but you're hard pressed to tell the difference in speed. The Wi-fi is a nice capability too.
so far i am digging it. the 3g is supposed to be a lot better then the original one. got the phone before the data plan goes into effect, but i can get on line through the wifi. i played around with the G1, and did not like it.