I bought one this week for a price I couldn't turn down (speaking of that, these are not valuable guns--if you can live without an original box you can get one for around $500.) It's extremely cool but there's nothing it does well other than hold 19 rounds. I can't see why I'd seriously use it if I had a USP, Glock, Sig, etc available. And I don't even like Glocks. Keep in mind this thing wasn't designed as a superior example of German engineering that HK is usually known for. It was designed to be a super cheap backup weapon in the event of the Cold War kicking off. One thing that gets overlooked while everyone's talking about the trigger pull, is that it reduces muzzle velocity (via oversized rifling) in order to work as straight blowback. You lose significant energy that way. And regarding the trigger, many of these guns have terrible machining in the striker channel. Really rough. I'm going to see about polishing mine slightly and see how it improves the situation.
Something I found very interesting was Ian actually taking the VP70M machine pistol out to the range. It appears to be just as bad a machine gun as it does a semi pistol.