I'd just like to throw out there that I have almost no issues with the DINC's reception. At work I get in teh range of -100 to -105db, which is terrible, and it sometimes drops to 1X. But most phones, including blackberries have issues ni my office.
BUT, if i'm doing better than -100 (say in the -90's) I do very well. I am coming from an Omnia, which I found myself saying "what was that?" a lot.
It is possible that these phones have a couple different radio chipsets due to costs or production speeds, locations etc... Unfortunately, I don't think there is any way to check what differences there may be in the hardware.
I am 100% happy with this phones reception.
I have seen some threads in the verizon forums where users were able to get far better quality and reception if they didn't block the back of the phone with their whole hand while on the phone. Try holding it to your head differently to minimize the amount of covered space on the phone.