I have to admit this unit is not perfect. I have 2 issues with it. Firstly the VV Gripper is made from 2 halves. While this seam doesn’t have any play, I’m concerned it may let liquid in especially around the button and threaded connection. I don’t overfill frequently but it maybe a bigger concern for those dripping. I haven’t had any issues over a few months use now, even with a few overfills flooding out from the cartomizer. Secondly, the threaded connector on my unit has just a small amount of play. It annoyed me initially but I’ve gotten used to it since. It’s something I’d expect it to be solid and it may just be my unit but it’s worth mentioning.