Hi Jon,
I have not heard from Kevin in a long time... About a year.
I think he's probably got a new hobby as I used to talk to him a lot.
Dunno...
I cant quite comment on the Quantum series stuff but I do own a few D.P.S.S. units out of Hungary and they seem well made..and look very much like that Quantum..especially the dual red unit, the case is almost identical to your green except the DB connector is on the rear of the unit. as with all the old units.
my green is the only working unit (about 300mW) as I got these in trade just to have a looksee at the design..
The beam is wide but clean at about 400mW. but at about 15percent IR , I had to add a filter.
Since these were problem units I didnt get much more out of them ..Saved for a rainy day.
The 500mW blue is not working yet as the crystals have seen atmosphere for too long. but still a nice design.
These seem to be old units perhaps the first series as the power supplies are large and a nightmare.
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http://repairfaq.ece.drexel.edu/sam/laserfaq.htm
*^_^* aka PhiloUHF