I just received this today, and I cannot tell you how glad I am that I decided on this PV. For those of you that don't know, it's a 3.7 device running on 14500 900 mah batteries. It is made exceptionally well. It feels solid, has the perfect weight to it, and the notched end cap makes it easy to replace batteries. It is a tad smaller than I thought it would be, which is a good thing. It's a very sharp looking PV and the etched PS logo gives it an extra touch of class. I chose the 510 adapter, and it's hitting perfectly and consistently! Just like those first few hits on a fresh battery...LOVE IT! Vapor and throat hit are amazing! I'm going on 4 hours of constant vaping (cause I haven't been able to put it down)and it's still going strong. I am using protected batts, and some people are saying theirs don't fit because the sizing isn't consistent, but I got mine from here protected 14500 battsand they fit fine. I also started using the plug mod for my carts and I haven't had to refill for 40 minutes! Here's the link plug mod If anyone has been thinking about the Protege, don't hesitate, just order! Plus there is a 6 month warranty and Puresmokers excellent customer service.