runs like a fuckin champ on my 60D. it is sooo worth it. the main reason i got a 60D over the 7D was for the ML. you can turn off the gay auto gain control for sound and it makes a world of difference if you have any sort of mic plugged in.
the only problem ive had is with the bulb ramped time lapse setting, i think i was setting it up wrong but all other features and functions work perfect. regular time lapse works perfect too