When I read these above comments about ISIS problems, it makes me seriously consider whether or not I would be better off to make my next unicycle a QU AX with Q-Axle to avoid the possibility of these problems. It is supposed to be sgnificantly lighter and stronger.
I have read aboout some problems with the QU AX Q-Axle, but those seem to be more rare than ISIS problems and was due to improper assembly.
I most likely want to go for whatever is most bulletproof and trouble free, but still works good, and will be a positive ownership experience. AS I explore this, I do not like external disks nor holes in my rims. So QU AX looks better, at the moment, unless other brands put Q-Axle on their products.
I started this thread asking about the Q-Axle: Q-Axle questions