Not so good for me...
I live in a poor reception area and have tried sim cards for Orange, T-Mobile and 3 and I can confirm the HD does not seem to get a signal, my Hemes would JUST get a signal and was good enough to leave on the side in the house for the push email and phone to ring, I always had to goto the window to talk though, but the HD only works at all if I go outside.
I really like the HD, the larger screen is perfect for me having quite big fingers, I even forgive the poor shutter performance of the camera, but a phone that gets no signal in my house is very close to a deal breaker for me and am extremely unhappily considering returning for a refund.
Incidentally I used to get the same problem with my old universal but not my Blue Diamond, I tried changing radio versions on the hermes to see if I could make it better than ever but the 3 different radio roms I tried all had the same signal strength.
I contacted HTC this morning (0845 8900079) they said there was no known issue and offered no help other than for me to return the handset
I'm not a happy nerd.