I use a DUC32 fork with a 650 wheel on my Ibis Mojo for XC racing, long trail rides, and Super Ds that don't require my 7" bike. I got 2nd at the first round of the Big Mtn Enduro Series on that setup. My fork's spring and damper are heavily modified and feel much different than other DUCs I've felt.
I have been running a DUC on my Knolly endorphin this summer. It has been a great fork, but the damper rod bolt keeps breaking. I'm gonna swap forks over the winter because I can't run shorter than a 75mm stem on it though.
My GF is rocking the SC32 on her specialized era, she won the Mountain Creek King of the mountain enduro with that set-up.
I rode a Matic frame for the last 3 yrs but broke it at the headtube/downtube junction the end of last summer.