Hmmmm the adjustable airflow does kind of intrigue me ... the site doesn't give the dimensions, so I'm officially telling myself that with a 5ml capacity it will NOT fit in my VTR ..... so THERE you enabler you!!!
*L* I'm not trying to talk you into buying a nautilus. Not at $3.50 per coil. But it's something to keep an eye on for if/when those coil prices drop.
Speaking of adjustable air flow, the Kanger Aerotank is pretty awesome too. And the aerotank bases I put on my PT2s and PT3 made a world of difference. No more gurgling and leaking on my PT3.
Kanger Airflow Control Valve - Protank II, Protank 3, Aerotank
edit: And Fear posts the same thing as I'm typing this post. Great minds.