Bruce has replacement parts for the MAP tanks, mine leaked when I first got it. He sent me a new clear tube and 2 o-rings (it was the o rings that were leaking). The cartomizer it uses is a cut CE2R4 that anyone can do with a $3 pipe cutter, or he sells them pre-cut if you want. I was actually suprised how thick the tank is, about 3x thicker then those cheesy clearomizers.
I am pretty happy with the tank construction. It is also nice to be able to carry that much inventory on board and see how much is left. I just don't see the spare parts on his site. No issues though if you followed the thread, since it is pretty easy to gut a CE-2 for the needed parts.