I am loving the 30w, I have to use my Orbtronic high drain 18650 2900mAh batt, because my older aw imr's were shorter and I would have to adjust the pin all the way up closing off the vents, and I have no spacers. I have not gone below 1 ohm though, and rarely that, so not sure how it works much lower than that. Works great up to 30w with higher ohms though, and more than enough for me. I got one without the logo on the tube, which I like, the logo sorta bugged me. I also see telescope tubes for sale for it, which you can use on the 20w legend v2, and 30w.
The 30w has a stainless top cap too, and I think the 20w doesn't, for what that's worth. It doesn't feel wimpy ether, seems well made for the most part, but I am more careful with it then the provari, which I have dropped more times then I want to admit, not really wanting to drop the 30w, not sure it would survive, but I really shouldn't be dropping anything. Glad I got the 30w though, so far really liking it.