I've been using the one from CanVape since the start of February. It made me want to use my ProTank 3 again. After six months, the valve has stiffened up to the point where it doesn't turn in my pocket, but it still spins when I'm trying to screw the tank back onto my mod. However, my all-day vaping is still done on an Aspire Nautilus. I'm waiting on delivery of a Nautilus Mini now, bought direct from Aspire. The video reviews for the new vertical coils sound very promising, but they're expensive as all heck.