OT - Anyone tried Bikram's Yoga?

[I Run Long]

I'm going to try 2 free classes next week and then see from there. I am very fit and do long distance running and weights but the weights are starting to bore me. Thought I might replace them with Bikrams. I know if will be really hard given the heat and contorting my body in ways that just seem plain wrong. Can anyone out there tell me about their experiences? TIA.