I'm a happy ML user with my 60D.
That said, I'd really, really, really be happy if they could find a way to implement microfocus adjust (MFA) via the ML software... I hate Canon for handicapping the 60D (it's apparently just disabled / not included in firmware) without the MFA, as I have a couple of lenses that are repeatedly have a minor back- or front-focus problem. Sure, I could send them all in (3 different lens makers) for a pretty penny, but I'd much rather be able to do it in software. After all, there's no guaranteeing that they'll be "in focus" with the next body I get (given manufacturing tolerances). Ugh.