I have a 7750 and have not experienced any problems with the reception. Just a matter of getting used, turn the volume up a tad and keep it away from your ear. If you hold it at a certain angle, it is hard to hear.
Heavily dependent on where you live. I lived in Edmonton, Canada - no problems at all. I moved to SLC, UT, horrible reception. The only reason I stayed w/AT&T was 1) I had no choice as it's my conpanies phone and 2) I travel so much it didn't matter all that much. I moved to Jax, FL about 6 months ago and have great reception -