Locally, my vape store switched to their bottom coil tanks being all t3s, stating they have fewer leak issues. I have experienced the opposite. It seems to me that the two part atomizer adds more variables to the leakage issue: two grommets instead of one (and one always seems to pop up out of position), as well as tightening to the base. I've had a few that I had tightened really tightly actually come loose enough to leak. I don't see how adding more variables that can cause leaks makes for a better system. I'm frustrated with clearomizers to the point I'm thinking of quitting vaping. I do like the protank, but wish there were decent clearos in all price ranges. I feel like I'm always throwing my money away on leaked juice and cracked or leaking clearos. Any thoughts?