Hightower,
Geeeez--you made me register on TFL just to answer your question.
"Hello" to all the TFL members, while I'm at it.
Anyway--my thoughts on the Detonics MK VI... I've had one since 1982. It's the only semiauto handgun I've owned (other than a Glock 27) that has NEVER jammed with ANYTHING I've fed it (crappy reloads, semi-wadcutters, etc.). Feed reliability was obviously a major concern with the folks in Seattle when they made the Detonics--smoothed feed ramp, widened ejection port, etc. Features-wise, I think the only differences between the Mark V and VI models are that the VI has a polished stainless slide (vs. matte) and comes with fully adjustable rear sights. If you decide to buy, make sure your Detonics comes with THREE rear sights for elevation (the included Allen wrench would be nice also). Frankly, I've never had to mess with windage, and I've always kept the tallest sight on, because the pistol shot low for me otherwise.
I had 2 problems with my VI. The slide stop on mine was slightly malformed, and wouldn't always engage the slide when the mag emptied. Detonics sent me a new one. Also, the screw on the captive recoil spring assembly would loosen after a while of shooting--a bit of Loctite took care of that permanently.
Be aware that all the chopped Detonics lose about 1" of sight radius because they put the rear sight forward and angle the slide behind it in a gentle slope (presumably to facilitate cocking with a quick thumb-swipe?). It is still a very accurate piece for its size. With its hefty 29-oz weight and 3-spring assembly, recoil is not an issue.
With its polished slide, the Detonics competes as the PRETTIEST gun I own, for what that's worth.
Well--that's all the thoughts I have at the moment. I hope you decide to buy, because the Detonics are a great bit of history, and they deserve nice homes! Good luck in your decision. -- JFrame