Higher power output for high wattage vaping, and changeable batteries are the big things. If you're not going to do that (or at least not at this time!), then the Spinner / Twist / Winder can work just fine.
The biggest dis I read about them is that they will eventually wear out, and fail to hold a good charge. True. Yet I also read about a lot of folk who, like Coca, don't take their big mod out as it's too big, to obvious, whatever, and go out with their Spinner...
I use a couple of 1300 Spinners. One easily lasts me a full day. During that day, I'll charge the other. Never run out of battery power. (I also have a 900 Spinner, an MVP at 2600 mah, and the newer Itazte VV3 which, contrary to all the listings, IS VV/VW, and a nice little 800 mah unit, all with fixed batteries.) I'm happy with the performance I get from them, and that's really all I care about.
Yes, in 6 - 13 - 18 months, I may have to replace the entire unit. But they're inexpensive enough that it's not a deal breaker for me. And the rate of change in this world is so fast, in that time there could well be a Provari-killer device at half the price.
VW is certainly nice, but the Spinners are so easy to adjust to get the same effect...