They are highly collectable, rare, exotic and pretty cool
Very much like a CZ-75 on steroids.
Models were standard 10mm, Special Forces "Dark" 10mm(black slide, stainless frame), Special Forces "Light" 10mm(all stainless), Military & Police 10mm(all black), Marksman 45ACP.
Marksman 45ACP is probably the best working gun, because of the 45ACP caliber.
Special Forces "Light" is probably the most expensive and collectable.
Last time I looked, which was a couple years ago, they were going from $1500-$2k.
However, the early model magazines were not reliable, and often would "self-eject" out of the gun while you were shooting. Later models were a bit better.
Magazines will cost you at least $125 each(used) if you can find them, and you can't be sure if they will work reliably in your gun.
Full power 10mm loads can break these guns, so be careful.
Parts must be bought from collectors, since D&D has been out of business for 20 years or more.
Good luck.
If it were me, I'd keep it as a safe queen, with only occasional firing, or no firing.
If you want a similarly designed gun to shoot, try a EAA Witness 10mm.
Almost identical, and cheap.