Did I post is in the wrong part of the forums or something? Sorry if I did.
Post a link or specs or features of the mod, we can help discuss it vs the DIY stuff we make. This sub-forum is for those that wish to make their own mods... "modders" = "mod makers", not "modders" = "mod purchasers" (although that happens too). lol.
You may wish to try the general section; you'll probably get 100 responses, all mutually exclusive. It's a subjective thing. lol. Someone has probably used that specific mod before. Since I make my 5 volt mods, IDK what to tell you about the others since I haven't used them. If you post a link about the "KVS triple V" or whatever list of mods you are looking at, we can tell you a lot about the electronics in it, even if we haven't used it (assuming we can get specs).
5V is a sweet spot, vv is all the rage, and if you haven't tried any of them before, you may wish to try a 5v PT+AC-USB adapter and standard atty 1st to see if you like it. If the box you are looking at is vv, it's adjustable to a range, so you may not have to try others out 1st.
And if you like to solder, this is really the best place to be! Making a 3.7 mod is fun, 5v PT is easy, a 5v box is only a little more complex, and vv is a bit more complex than 5v.
EDIT: Can be ordered in 3.7 or 5 V versions. IDK what electronics are inside. Looks solid.
Cozzcon did a review ........
http://www.youtube.com/user/cozzcon?feature=mhum#p/a/u/0/Kek1cYYlHUs