I have a cuboid, and it is my go-to device. I mainly use three devices now. The releaux is my heavy hitter, but it stays at home for obvious reasons. The cuboid I take out and about. It's been my main device. I haven't heard of the shallow 510 issue,and I don't seem to have any problems with my atomizers.. I mainly use goblin mini clones, and they have no problem. Besides, if it did have a small gap, that just means that the heat won't transfer to the mod, and it won't scratch it up as much. I do use Kepler type fins on all my mods though, so that could also be an issue.
The last, I seem to be using more and more, is the Cloupor mini 50w. it fits real nice in the pocket, and is shorter.. with the atomizer... than a 12 oz can of soda.... something to be impressed with. of course, that is only a single battery mod.
All three have been reliable with absolutely no issues.