I've only used Panasonic 18650, 3400 mAh flat top batteries in mine so I can't say if the button tops make the door pop open. I highly doubt that it would, though, since the door clicks closed and you have to push a little lever to open but I could be wrong.
You know, if you want something to help you stop smoking...in my personal opinion...I would spend that $200 on at least two Vision Spinner II batteries, a couple of chargers, AC adapters, two or three tanks and several 5-packs of coils and a couple of sample packs of juice. That's a lot more equipment just in case something goes wrong with one or more things. With just the VTR, you're putting all your eggs into one basket. What happens if you drop it and it breaks? Do you have a back up for it? What if your back up won't work? Do you have a back up for your back up? Just some things for you to think about. If you have back ups, that's great. Go for the VTR.
I have a VTR that works great. It doesn't get used very much though. I much prefer using my Vision Spinners. They're cheaper, they're very reliable, give consistent performance, and they're easy to use on the go. The VTR gets a little clunky when you need to be out and about.