I've never heard of them, nor can I remember seing anything about them in WatchTime or Orologi magazine, not that that proves much of anything. Look.... I can only pretend I know what dropping a 5-digit figure on a watch is like. My most expensive purchase, ever, was a previously-used Ball Fireman ll owned by a fellow WTF member.
But if I were to buy a G.O., I would
***Figure out which Authorized Dealer(s) I would use, find out ALL the details on what is covered by the watch's warranty and then compare that to the warranty offered by Delray. Purchasers often lose some warranty benefits when buying through the grey market. Not every part or function on the watch may be covered. Likewise with service after the sale.
God forbid something is wrong with your watch, but if there is, will Delray honor the watch's servicing needs or repairs the same way that the AD will? Some grey market vendors won't even cover something as simple as replacing a cracked watch crystal. and did you know that if, for example, you go and install something as minor as an aftermarket bezel on your Rolex Submariner, Rolex has the legal right to disavow the watch's ENTIRE warranty and can consider your watch a counterfeit, even if you can prove you used a Rolex AD. I know it's an extreme example, but it illustrates my point of knowing all your rights as a customer.
*** Ask Delray if they are willing to supply you with contact information on previous customers so that you can ask other buyers what kind of buying experience they had. I know that if I were selling an $18,000 watch, I'd want to make sure the potential buyer was feeling at ease with the pending transaction!
Good luck. And come back to let us know how things turned out, or even if you have other questions.