I love them.
I got two batteries and some of cartos, and found the vapour production better than any other cig-a-like ive tried, and alot better than corner store types. The regulated voltage is a huge plus because getting less of a drag when the battery runs out lets most other models down. The auto aspect is less over sensitive in sealed models as well, meaning it doesn't trigger off while in your pocket etc.
I ended up getting another battery and a mega PCC (not that I really need it). I dont chain vape and a full battery lasts me 1-2 days (and thats the two 220's, not the 320, which I also have one of). And I won a prize from smokeless image, and am getting a small kit for my mum.
I recently discovered that the innokin tidy10 nano sized clearo works fanstastically on this stick model, producing a really thick cloud.
Initially everyone warned me and advised me to get a bigger battery, low resistance, variable voltage etc. I am so glad I completely ignored all of that. Battery life suits me 100%, it lasts longer for the mah than one would expect, and if you dont chain vape, it gives a decent life. I only vape as much as I smoked.
With the innokin tidy10, it gives a pretty warm vape, and IMO, personally i wouldnt want much more than that. At 24mg nic, my throat would struggle if it were much warmer I think. In fact I am inclined atm to alternate between the innokin and the standard volt cartos (which are also good cartos), just because I am getting plenty of throat hit, and don't want to overdo it.
Anyway thats me, a very happy volt user.