They're bomb-proof. I've seen the ZTR Flow rims on 200+ lb guys riding 6" travel bikes and the wheels are the only things that survive their massive crashes. I'd rate the Flows over every other rim for all mountain, freeride, street, dirt jumping, and mountaincross. They build up a superlight wheelset, that's for sure.
There's not a huge difference between the Five and the Seven besides the color and the pad contact point adjustment. We had the Fives in stock at my shop so I picked them up. They're better than the Hopes I had on there before, that's for sure, since they work consistently.