I bit the bullet and bought a Smok Koopor Plus 200W the other day. I didn't buy it for the 200W rating. I bought it for the dual replaceable 18650 batteries that will give me two days of vaping on a charge.
So far, so good. It will go from morning one day until late afternoon/evening the next day vaping at 10W. At that point it's showing 1/4 charge left. At 1/4 charge the batteries are reading about 3.4v/3.5v, so it's probably going to declare dead batteries at 3.2v. That's a little lower than I like to see them go, so I charge when it gets to 1/4 battery left. It's wider and taller than my other box mods by 1/2" or so. Since it's stainless steel with what appears to be a powder coated paint finish, it's a little heavier.
It does VV/VW with Kanthal and temperature control with nickel, stainless steel, or titanium coils. It also has a strength setting that varies the rise time of the voltage to the coil to make it a harder hit or various levels of slow rise soft hit. I guess that gives you time to start the air flow from a hit before the heat maxes out.
It was $69.99 at the local vape shop. Online it's commonly found at around $50.