This - a bit of a pain to fill through those little slits with a bulb dropper, but it can be done as long as you do so slowly without leaks or drips.I fill it right to the top of the metal ledge when there's almost no bubble left in the glass....never leaks
also, DON"T over tighten the bottom part, the metal seal works perfect when you just snug it.
Mine gets hot if I start chaining it at 50 watts or higher...I don't see it as a problem, just to be expected driving that much power to the device.I just picked one up the other day and I love this thing. By far the best flavor out of all the tanks I own. I fill mine up as far as I can go before it starts spilling into the chimney.
Only downside is mine gets extremely hot after a few mins of vaping. Anyone else have that issue?