One thing is sure, the carto is they way to go on afs/avs, but then the HUGE collector tank is really not needed since it never leaks (avs leaks from the top actually, not bottom).
So imeo, are we going to see a GGTS/AVS without collector anytime soon, that would help reduce the length of the combo.
On a side note, does anyone use the collector ? i mean it's a nice idea on the paper but first, it doesn't leak (or maybe with atomisers?), second, i wouldn't inhale what's been through, rotted for several days in the tank.