I have a Sigelei 20w. It's built like a tank and works fine for what it is. I can fire anything down to about .6 Ohms with it. My biggest complaint is that it can't regulate voltage below the current battery level (none of the 20w-30w chips can right now, AFAIK). My only other complaints are relative nits, like the dim OLED display, and no wattage memory/pre-sets.
Of course, the 30w version is the same price or cheaper (app. $80), so if you want a vw regulated tube mod TODAY, you could get that.
If it were me, though, I'd wait a couple of weeks for a mod with the new SX350 chip (if they aren't out already).
Also, having picked up a full-size regulated tube, I think I'm sold on box mods for 18650-26650 batteries. Topped with a Kayfun, the thing feels and handles like a lightsaber, and looks kinda ridiculous (IMO). And it tips over easily.
Next regulated mod will be a box style, for sure.
