I chain vape my protank all day long, but I also rebuild my own coil heads and wick with cotton so YMMV. I generally can't run it much higher than 8-10W though without beginning to develop a burnt taste.
I was able to push my Innokin iClear 30 @2.1Ω all the way to the max (6V / 15W) on my SVD without issue, though I found it did best around 13.5W. I'm not a huge fan of top coils or polycarbonate tanks though, and I found it blew through liquid way too fast for me (though it did put out tons of vapor doing so). I still keep it as a backup, but I prefer my Protank 2.