The MVP 2 is a good device. It was the best thing I had before I got my Provari (now the MVP is my secondary device), and I think it was money well spent. The only toppers I've had issues with were a couple of T3s clearomizers because they weren't making proper contact with the center pin. I pulled their pins down just a tiny bit with a couple of wiggles, and now they work just fine, too.