Mine arrived today from stormy's. No issues, really happy with it. Got a few replacement coil units too. Only thing I didn't like was the whistle tip. Never encountered that before. Just swapped it out for one of my own. Problem solved. I'm vaping Captain Jack from Halo right now and the flavor and vapor is just right. Nothing mind blowing, but no plastic taste or scratchy feeling either.
I'm using a good ol' eGo Twist at about 4V. I've got one of those plinth-type covers screwed onto the eGo cone threading. Not necessary, but it "completes" the look.
I don't think it would be possible to replace the tank, since the top of it is adhered to it. Could be wrong though. As long as the diameter of whatever tank and top matches the bottom plate (and, thus, the coil head) I don't see what the problem would be.
Having finally had a T3 go cloudy from a STRONG cinnamon menthol juice (fire 'n ice...from....a juicy place) I'm now twigged to that issue.
But anyway. Yeah I like this VapeOnly doohicky. Who's the manufacturer? The box doesn't offer any insights.