I have mixed feelings on the protank. I love the design and with certain juices the flavor is fine. I've become a huge fan of Boba's Bounty and cannot, for the life of me, get it to taste right with the Protank 2. On the protank 1 it is hit and miss. I've gotten in the habit of rebuilding my heads with 3mm wick and 32g kanthal. It's a bit of a chore at first, but after building a couple I've found it to be cost effective with better performance. Unfortunately, I cannot get it to taste as I think it should, very muted and watery. I've given up on the protank and use the vivi nova for BB. Much better taste (yesterday I got my first RBA and that is better than both the vivi and PT, but out of the scope of this thread).
So there are alot of variables involved that will alter the performance.
I feel that rebuilding them can drastically improve performance. But I understand not everybody wants to get that involved.