Fired off a really succesful cloth simulation today. Either I took my smart pills or the 901 update fixed some of the dynamic issues I was having with softbodies. Tons of polys here and I was able to run the sim and tweak things without the whole project crashing / dragging to a stop.
Sims are like setting up a elaborate mouse trap to me. Build up all this stuff, then fire it off and watch the reaction. You can never really know how it will all react.