Hola
@Kent C ,
This tank has served me faithfully for over a year and I have a couple of tidbits for ya...
First, the top airflow is nice, but you have to adjust your grip on the ring so that you don't end up unscrewing the top cap instead.

Also, you need good vision to "See' the tiny air holes clearly enough.

The extender kit is a must but it comes with its own issues. The extending chimney is screwed to the top cap and then the coil, lots of times when I want to refill I end up unscrewing the chimney and the coil

You get used to it though
There are two coil options: 1.5ohm (rated at 14-22 watts) and 1.8ohm (rated at 12-16 watts). Tootle puffer heaven

Good luck