I use this with the +ve end of the battery down, I found it to fire every time, with no misfires that way around. It makes no difference electrically.

The switch base is lacking an insulating ring, so you need to ensure the wrap of the 18350 isn't damaged. The switch works. It feels neither good nor bad, it just is.

The threading is spotless and easy to use. I use mine with an Aspire Atlantis fitted with a 0.5 Ohm coil, and it works perfectly. Just the right size for a few hours use away from the house. So, it looks good, it works well, it's well made and it fits in your pocket. I haven't had it fire unexpectedly, and it fires every time I want it to.

Recommended.