I rarely write reviews, and only when a product really blows me away, like this one. First, the charge keeps for days. I'm not sure how much you want to vape, but this device holds charge for hundreds and hundreds of vapes. Very very reliable. 510 thread is perfect. A .5 cartridge has a very low profile when screwed in. The 1. cartridge has a low profile as well. The device does fit nicely into any pocket or pouch but if in your pocket, it can be a somewhat heavy feel. As for its "hide and hit" factor...a clear 9 out of 10 to camouflage your vaping. All in all, 4.7 out of 5. Excellent.