i too heard about the vac problems at the start but i think it was the baffling or lid that needed perfecting - i havent heard of problems with the triple vac Airflex so i am assuming it was sorted early on - could any triple vac Airflex owners confirm that?
I do like the triple vac Airflex - it has a lot of the Scorpion qualities - triple vac, no pump needed to use it from an external water tank etc, but it has the advantage of looking better, having proper switches, generally better put together and looks so much better to work on