I had a canon 70-200 f 2.8 is IS L lens. I dropped it, she be toast. I'm getting new one, but after talking with a professional photog who's familiar with the type of work I do, I'm getting the non-is version this time around. $900 cheaper!
I primarily shoot dog agility in dark horse barns. I almost always am using a monopod. The only thing that's rocking and rolling are my subjects that I"m trying to photograph.