The MVP v.1 has both the ego threading and the 510 threading, as does the v.2 (from the pictures and descriptions). The difference between the two seems essentially to be the variable wattage and ohms reader. The v.1 is "only" variable voltage. Personally I don't mind sticking to variable voltage, which I am very comfortable with. However, other people swear by variable wattage...
Thanks and thanks to the others. VV and VW is all the same to me. I adjust up or down constantly whether vv or vw.