I got my ProTank on Monday and put it on an eGo-c Twist (currently my only VV mod) and have found it to be a very solid tank. No leaks or other issues that some have had. The flavor has most certainly changed over the days I've had it and I suspect it will continue to change as the metal components of the unit begin to "season". My experience right now is that it takes 4+ volts for me to start seeing it's sweet spot. The flavors I normally use are considerably muted in this tank versus a carto tank system, but it is vaping like a fiend. I honestly think I can put some of the more spicier flavors, such as a Chai Tea or cinnamon mix in this tank and really find a great vape out those flavors. On the dessert flavors, the tank mutes them more than I prefer. I am mostly running a mix of 50/50 juices through it right now and the amount of vape it produces is huge, so playing with the wicks on my current coil don't strike me as a solve to get a richer flavor out of it. Aging the tank may help in my case as it does seem that the more I use it, the more the flavors are starting to come out. I have only put about two tanks through it so far as I am also playing with a BCC Mega Clear at the same time and enjoying the way it is vaping also. Anyway, I am going to also try another recommendation others have brought up here on ECF and pick up some evod heads to go in it and see how that works. I would have to say, even with it muting the flavors of some of the juices I currently use, it could really rock some other flavors I find too strong in my other carto rigs, which definitely fills a niche for me. We'll see how it goes. So far the tank has proven to be extremely ruggedly built and a very reliable vape. No leaks or other nonsense that others seem to have experienced with it.