The only negative maybe about the km3 is the AF adjustment. It has a screw adjustment that is kind of hidden under the 510 base and maybe isn't as precise as a more traditional afc ring types. Personally, it's perfect for me because I'm the set it & forget type, but if your the constantly tinkering and changing AF guy, it could be a con. I agree on the vct mini, mixed reviews . Another post here mentioned the vape droid, that is another one I have been looking at.
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i watched phil busardo's review of the droid last night and like it a lot...a little harder to find than some of the others but it is certainly one of the ones I like the most so far...as for the set and forget i'm ok with that, once I have a draw I like I pretty much leave it alone