I have some sweet tapes with the 568s... most recently are Ira Stein's Ratdog Beacon shows from last fall... taped from the loge... their bass extends lower than most hyper caps (including the ck63s) and so, in some situations, can give you the hyper sound with more robust (yet controlled) bass. I ran hypers in the sweet spot FOB with a nice angle and pulled a great tape, but wished I had more bass... Ira's 568s got that extra bass.
I do not have any tapes with them from a venue smaller than the Beacon, though. I'm afraid in those situations you might get all sorts of bass (too much) and tinny highs. Good luck.