+1..Rocky Gravely is a reputable breeder.
As far as gtps tolerating handling..I think many of them do. I handle most of mine whenever I want to (day or night) and they do not seem to show any signs of stress (they are not jumpy, do not miss meals, etc). I do not handle my biak often...she is not aggressive but she's a bit jumpy, breaths heavily, and overall does not appear comfortable when handled. I also do not handle new acquisitions for at least a month or two. There is a vid of one of my males being handled here: http://www.youtube.com/watch?v=Bke-NRE6unQ which is pretty representative of his overall demeanor. Most of my animals have very strong feeding responses (and have been known to strike at anything warm OR moving) so I always turn on the lights for a few before opening the cage.
I do not consider any of my gtps to be "aggressive", although as with any species, there are many aggressive specimens out there.