I have been looking at their stuff, but it is quite pricey. I would rather wait until I can trade for a frag...
The only person I have purchased high end "rare" SPS corals from is Steve Tyree. Now he has had some really amazing stuff as well and it was not as expensive. (Although his prices have gone up considerably since the last time I ordered.)
There have been a # of GB from Atlantis. Their prices are on the high side but we usually get some type of discount, free shipping and some frags throw in.
Atlantis is on my short list of "going to make significant purchases from" once the rock in the new tank has cycled. Them, Reefer Madness and Dr Mac's (for those solomon's a. milleporas. Thank god someone has the farms there going again).