personally, I own a Buzz, and it's the only thing I use on a regular basis. I have other stuff here (ego, kr808-d1, kr808d-2, 510 batteries, copper, xhaler, and more), but the buzz is rock solid, and I have had absolutely no problems with it whatsoever. at a later date I may have problems, but up to now, it's perfect. I'm also VERY hard on my ecigs.. this thing has been dropped, kicked across a parking lot, dropped, dropped, uhmm.. dropped but not sunk in water yet. this is the best mod I could get when I bought it, I may look into a new buzz pro when they come out, but maybe not. If you're looking for something that will continue to work forever, including after a nuclear blast, go mechanical, something like an xhaler, or a GG, or something along those lines, they will work forever with a bit of tlc and cleaning.
this is just my opinion, YMMV.
Thanks
pat