I have a Provari (I'm not bragging, I'm over-spending) a 650 Twist, a KGO and an ego-t. I usually have all of them going at once but use the Provari the most. But I get tired of it and put the vivi nova on the Twist. Ah, simplicity. Maybe it's because I'm used to having small things in my hand {cough} but it does what it does so well. So simple and lightweight like I used to be, actually I'm still simple. Lightweight? I passed that exit 50 miles back.