I've been using the .5H coils on my Nano for some time now. I go back and forth between direct lung hits with the airflow wide open and MTL hits on the smallest airflow setting, which I think produces the best flavor. My experience is similar to VapMirror's with respect to how long they last - depending on the gunk factor of the juice, at my average tank-a-day usage, I change coils about every three weeks, which makes them very economical even if you don't recoil/rewick. I have only used 1 each of the .5V and 1.2V coils and neither for very long, so I can't comment on their longevity. I was not impressed with the 1.2V at all. I found the flavor to be lacking, and although I never got a dry hit per se, neither was I getting the really saturated, flavorful hits that I get from the .5H coils. For the same reason, I prefer the .5H over the .5V. Although the .5V performs much better than the 1.2V, it still doesn't seem to deliver the dense, "wet" vape that I get from the .5H. That said, my experience with the vertical coil heads is admittedly limited. Also, I have only used the verticals on the new Subtank Mini and have only used the horizontals on the Nano, so perhaps the different airflow configurations on the two tanks accounts for some of the difference. I haven't done a side-by-side comparison, but even wide open, the single airflow opening on the Nano would presumably constrict the draw more than the two air holes on the Mini so that more juice is pulled into the coil. Seems like a stretch, but it's possible - and maybe worth picking up another couple of .5V coil heads to test the theory. Anyway, I hope some of this helps. Sorry to be so long-winded - I'm obviously putting off starting work this morning