I don't know if this has been discussed but the problem I see with VSF is the case milling on the back where the SEL's fit in. There are what appear to be CNC pilot holes visible in the corners, which is from over travel of the milling bit. And when this occurs there is usually a big gap from the back of the SEL to the case. Sometimes it's in all four corners, sometimes one, two, three corners. To me this is unacceptable considering cheap Canal St subs don't even have this issue. I have a VSF 126610LN on order with one of our TD's and I'm rejecting QC pics because of this. It's case by case, no pun intended, so eventually one will be good, but I'm really surprised they don't fix this issue for all production.
Once you see it you can't unsee it. Perfect example of this: