T-Mobile has been good to me. Plus I get to hop onto Cingular's network. Anyway, the Samsung doesn't seem that impressive. That is based on this review here. Hopefully it's the same model you are referencing to.

http://www.infosyncworld.com/reviews/n/6339.html

The bad:
No voice dial = having to look at your phone to dial a number.
It is only Tri-Band, I would rather have quad-band
Poor Battery Life and a mediocre navigational pad

Anyone seen the new V3 yet?
http://www.motorola.com/motoinfo/product/details/0,,95,00.html