I weigh ~84Kg They cost almost twice as much as a set of CZs in the US.
Top model (aluminum with cuffs) Air Trekker CZs are ~$350 shipped. 7's are $530 + ~$40 shipping.
Since the performance so far seems to be roughly equivalent, if they aren't twice as durable as a set of CZ then they're not worth it.
I'm bottoming them out, but not hard yet just a soft stop at the bottom, and I think its mostly cause my timing is crap from not bocking. Still getting easily 5-6ft on those straddle jumps, and I feel like i have a lot to re-learn on my technique.
Update: For another data point. I had a pair of s-rex springs on my Poweriser frames in ~2009, at the time i weighed ~100kg and found them to be too soft. I could only get ~ 4 ft of air from them and bottomed out constantly, where i could get ~5ft from PR90120 and bottomed out less harshly.