Yep, tight for me too, I like the Berserker Mini on one of the middle holes, so possibly not as cheek-suckingly tight as some ........ but tight nonetheless.
There wasn't really enough time to check them all out properly - that's why I'm buying a clone so I can mess about with it to my heart's content. I just got to see how it worked and, though I dislike the plastic tank, it seems well-designed and I liked the way it was put together and vaped.What insert do you prefer with the dvarw?