I am fairly new to vapeing, (2 months old), so I haven't tried a lot of things. I started with the go-go and moved on to the zmax 2 weeks ago. Until today my favorite delivery device was the vivi "neptune" nova, it did a good job wicking and produced good flavor and TH. I also tried the T2 and lots of cartos, didn't care for the T2 and mixed results with the carto's, (mostly good). Today I got my protank which is my first experience with a bottom feed tank and I love it. This tank is the best thing since sliced bread. Previously the highest I could take my zmax was about 11 watts in RMS mode with the neptune nova before I would get dry hits. With the protank I can max out the zmax at 15 watts and I get great hits and awesome flavor. I had to keep taking the tank off and checking to see if it was leaking it was wicking so good, it was not leaking. The take is made very nice with good threads and thick pyrex. No leaking issues and a fairly airy draw but it produces so much vapor it makes it perfect. A stainless tank would be nice but it really doesn't matter because it performs so well the only issue I can see is the chrome plating might wear off after a while showing the brass or bronze underneath.This is exactly what I have been looking for I am just upset I only bought one. I definately will be buying more of these for I have found the holy grail of delivery systems.