I had a Cannondale cyclo-crosser with headshok.
In some ways it was amazing - Very fast, very light and very comfortable with the front suspension.
But...
The forks were basically the same as the MTB version. Meaning the fork legs were very far apart. The position of the canti mounts would not allow most brake pads to touch the narrow rims.
So I had to find canti pads with very long posts that could be spaced inwards enough to actually touch the rims when braking. Even then, the brakes were always useless;
The steering was fine in a straight line, but the thing would NOT corner or hold a line on a bend. I'm still scared by the memory of one commute on a 3-lane roundabout - In the rain, when it nearly spat me under the rush-hour traffic;
I managed to cross-thread the front canti cable hanger (having NEVER cross-threaded anything before or since on any steel, alu or Ti bikes);
The chain stays were far too tight for decent UK mud clearance with the 32C tyres fitted;
MAYBE I should have expected this type of thing from such a "specialist" bike. Or maybe it was just a "Friday Afternoon" lemon, compounded by stupid design?