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I've seen people describe that but needing to mount them with a particular technique and having to over-inflate to seat the bead is a bit of a PITA for everyday wheels... especially if you're at the side of the road surrounded by broken tyre levers, in the pouring rain, freezing cold and late for work thinking "did that post on LFGSS tell me to start at the valve or opposite it..."
atk-
The technique is not as diffcuilt as people make it out to be.
Basically what it involved is;
fir the tyres in, one bead first in the middle of the rims, this is important, important enough that you can actually do it with just your hand.
If it doesn't fit in easily, double check to make sure the tyres bead is in the middle of the rims.Now inflate the inner tube enough to give it a shape, now fit the inner tube inside the tyres.
Next step is pushing the inner tube inside the rims, if it get harder, deflate slight and repeat this step.
Neaing the valve, push the valve inward to ensure the inner tube don't get caught between the rim and bead.
Now that the inner tube is inside the tyres and rims, the last step is the last bead.
Start opposite from 6 o'clock from the valve, then push the bead both side toward the valve, until it start to get tough.
Deflate inner tube and repeat until it get harder, double check to ensure the bead is in the middle.
It should fit in nicely by that time.
Of course over-inflating is a bit of a PITA (usually need 60-80psi on MTB, 100-120 on road), but it no difference to running tubeless actually, or tubular come to think of it.
All this work on the ZTR Crest, tyres such as the Challenge may required a little more finesse, but should work ok.
And work in the pouring rain, no technique in the world gonna make that enjoyable.
edscoble
Crest are not difficult to fit.
Actually fairly easy if you know what you're doing.