This post is going to echo some other comments here and there. I received my mini on Friday and to my pleasant surprise it included the matching eGo One Mega tank and two coils. One of the coil gaskets was red and the other black so I had to do a little research to find out what each coil was made of. Then I had to run out and pick up some 18650s and charge them up.
Juiced up the E1M tank with a Ti head, made sure all of my settings were correct and commenced to
vaping. It worked and worked well. I vaped the afternoon with that setup before switching over to a Subtank Mini with a Kanthal RTA build. Screwed on the Subtank and... Oh, oh... She's a wobbler. Screwed on two more Subtank Minis. Both wobblers. This was not looking good. Screwed on a Castle RDA. Didn't wobble but didn't sit flush either.
Since the mod was free I figured a little exploratory surgery was in order. At first, I didn't like what I was seeing. It was shades of 2013 quality 510 connectors. The 510 is, pretty much, free floating. It slides into a shoe (metal) on the case side and is held in place horizontally via a key slot (plastic key) on the board side. From what I can see the 510 is designed to be secured by screwing on your atty. The threads on the atty pull the 510 up to seal against the case. It's actually not a terrible Idea and not nearly as bad as I originally thought. My biggest concerns are the key wearing out and leakage past the 510. Depending on the production run; the case shoe might have tight a enough tolerance to hold the 510 should the key wear out. Using an atty that allows the 510 to seal against the case should handle the leaking bit. The Subtank mini does not appear to be one of those attys.
I took some quick measurements and it looks like from the base to the bottom thread on the Ego One 4mm with its pin extending to 4.5mm. From the base to the bottom thread on the STM is 4.5mm with its pin extending to 5mm. Case closed. No more STMs with the VTC Mini. I wanted to try out some new tank tech anyway. I've grown to complacent with my STMs.
I updated my firmware yesterday and am happily vaping away. All in a all a good product and a great contest. Thanks again for the swag!