The rear hub on some models has some "issues" with the bushing (screaming at speed) easy to fix, but needs doing regularly if you do a lot of miles. Eventually the bushing dies and needs replacing, which is also an easy, but potentially time consuming job.
The rims, if the wheel is more than 3 or 4 years out of production will be either astronomically expensive or unavailable. There are also a couple or more instances where two model years of wheels, that are nominally the same (Model name and specification etc) will use a completely different set of bits, rims, spokes, hubs........... so again, a bugger to find spares.
Also, a very very few of the hubs use odd bearings that you may need to shop around for.
Not to mention that the Kysirium is a deeply deeply unfashionable wheel as far as aftermarket is concerned, not very aero and not very light. Worst of both worlds (for the money). But massively popular on the OE market, buy enough of them and they actually start to look like a bargain!
If they are cheap enough, go for it, but don't expect them to be infinitely rebuildable and serviceable.