I own a 510, and it is my first and only PV. I like it pretty well. There seems to be a lot of d**king around with it to get it to work right. (Which is okay if I am home) I am looking into getting another one and could use some help from people who own the models I am looking at. I've narrowed it down to the Evo, the KR808D-1, and the Sidesho. I need something that has good battery life, vapor production, throat hit, and less maintenance. I have no interest in the battery mods, so don't bother with that. I want to get a feel for what will suit me best. I like the idea of the cartomizer for convenience when I'm out and about, but have seen mixed reviews. Also the Vapor King looks kind of cheesy (No offense to Mr. Smilin, or anyone who owns one, it is just my opinion. So what I'm asking is, out of these, which has the best battery and cartridge life, best vapor production and throat hit, and less maintenance than the 510. Thanks to all in advance.