I've just this morning taken delivery of this lens (second hand). I think it's about 3 years old.
I'm just a little concerned about the noise of the IS motor. I've read that it's noisier for this lens and I expected that.
It's the duration of the spin that I'm wondering about, it seems to spin for about 2 seconds which is longer than any other canon IS lens I have.
It doesn't taken that long to lock focus, that's pretty instantaneous. Other than that it's in excellent nick and very sharp.