multi/poly and syngut/poly snaps in 2-3 hours for me. Spin potential isn't bad, but the cost of play is astronomical. gut/poly has yet to snap, and I have to cut it out when the gut gets too flanky.
poly/multi generates quite a bit of spin, but the power is noticably lower than gut/poly. I get about the same spin, from what I recall, but I didn't like the sharp power drop on my midsize rac's.