I just got mine Friday.
Great things - It is great! Dove with it last night and today. Super bright, like it should be. The cannister does not open (yes, it is screwed on), so no chance of flooding. To charge it, just unscrew one large screw, then plug it in. Easy adjustable beam. Their customer service seems great thus far.
Issues - Apparently, the bolt snap and i-bolt pictured on the head unit does not come with it (I wrote to them about it, and their answer implied that), so went to West Marine purchased a SS i-bolt, and used their chain cutter to cut it down to size, 1/3 inch long. The canister comes with two adjustable hose clamps. How you attach it to your bc is up to you to figure out. At West Marine, I stumbled across pliers with a cordura web strip attached to a belt loop. I put the strip under the two hose clamps, and voile - the solution.
My soft goodman handle works well, and I like it better than the hard, however, the two slots the velcro goes though in the metal piece was manufactured so sharply, they cut through 75% of both velcro ends. I just wrote to them about it, and expect them to send me a replacement Monday. I can jerry-rig something in the meantime.
Would I buy it again over any other 10w HID - yep, and don't even have to think about it twice.
P.S. I bought mine on Ebay directly from Nite-Diver. I saved $185. I think they are simply trying to get their product out there. Its brand new with warranty. They may do another auction.