Have done about 5, a few have been really good and a few have been pretty shit. The pretty shit ones generally were because either i was riding shit, or the sections wern't what I prefer to ride. Most enjoyable was probably the Kortrijk comp in Belgium Kenny Belaey put on, was much more of a UCI style European set up with big rocks and nicer lines rather than shitty muddy wet mossy rocks you have to wheelswap everywhere like you get in some of the regional comp series.