I ride the 2011 Flux TT30 binding for all-mountain, freeriding and pow. For my weight (67kg), the highback is firm enough and I find the binding to be comfortable and responsive, especially the straps. There's no canting and little padding on the footbed. I think the TT binding has gotten softer over the years since my model.
I rode my friend's 2014 Genesis recently and were very impressed. They were comfortable, flexed organically if that makes any sense, prolly due to the Reflex. The ankle strap was super comfortable. I thought Flux straps were king but the Genesis strap really impressed me. I was also very impressed with the helical buckles and how much faster they are on the take-up.
Now I want a pair of Genesis, dangit