I have a Nokia 6610. I got it a few weeks ago in a hot deal from T-Mobile. Only cost me about $35 if I remember correctly. It has much better reception than my old phone, which was a Nokia 8290. I could never make or receive calls when I was at college with the 8290, but it's much better with the 6610. I wanted a SE T610 but I heard the reception isn't that great, and I need good reception. So I got the other phone that has a "610" in it.
Overall I don't have any problems with the Nokia 6610.