I've fired a few of the VP-70s; two of them were the select fire models. I have a buddy who owns a civilian model. They're huge guns shooting a light round, good for full auto - silly for a semi-auto. They have a horrible trigger pull, aren't known for being overly accurate and for a HK weapon, they are not all that reliable. They are uglier than the glock; but I loved shooting everyone I ever played with.
The lack of a "second strike capability" is a non-issue. If you pull the trigger and get a click in a combat situation I can't imagine anyone trying that same round a second time. I don't know of any 1911 users who went to another gun because they didn't have this feature on their pistol. I don't know of any police or federal agency that has reported more NDs with the glock than any previous handgun they issued. People who have NDs are going to have them, regardless of the gun they carry. It was the pistol of choice in Iraq. There are a lot of choices available. Everyone has to go with what they like the most.