I've run a set of MC23s on my DR. Work well, except they have a very low sidewall for the width, ie low profile, that is at odds with the numbers so speedo and gearing are affected, and more chance of pinch flats, if you run tubes.
I know guys who run them up back on 990s and like them, but not so keen on the fronts, MC23s still.
These MC60s have got a good write up in a local magazine who have a S10 long termer. But then they did get them for free, so who knows?