I have both. My ZAP arrived last Friday and I have been using it almost exclusively since then. However, I think that's mostly due to it's being new. I don't find any difference in performance between the Mini, the Standard, and the ZAP. Normally, it's just whichever one happens to be closer. The bottom button is not a problem once you get used to it. I do find myself trying to work the ZAP by pushing on the bottom.........All the tops are exactly alike, and perform exactly alike.......the bottom part is just a tube holding the battery..........and the number of coil wraps provide the ability to get the vape you prefer regardless of which tube you're using.......The only difference to me is a mechanical APV vs an electronic APV and for me, a mechanical APV is best and more worry free than electronics which may become iffy with age........
Thanks for the input Im sure a lot of people here were wondering how the VV tube would compare to the All in one.
I agree with the reliability of the of a Mechanical unit. I just felt more comfortable with a more sensitive switch so I adjusted the magnets to 1 big and 1 small but its a bit shaky when I set it down and it gets me paranoid.
I'm at a lost for words except -- TY Zen master for starting this great journey & TY to all those that saw the light & decided to join in on this wonderful experience, TY to all the veteran Zenfidels for all the love & support, TY K-man for letting me experience the Zen virtues 1st hand 
There are a lot of us that like bald guys anyway.. dunno why guys make such a big deal out of it. I have three favored hair styles on guys.. all bald, half bald pulled back into a pony tail, or short spiky dreads.