For many reasons, a cheap intervalometer is a great investment.
For example, I've used mine to take a group shot with the following recipe - wait two mins, then take 10 shots two seconds apart. This gave me long enough to climb back up to the group and we used a phone to judge when the shots were being taken.
I've been thinking about trying ML as it also offers motion detection good enough to capture lightning and focus peaking which would be useful with my tilt-shift lens.
I haven't given it a go as a lot of the good stuff has been waiting on this release.
At the moment, the documentation is rubbish, but I'm sure that will change!
And there is always the big catch stated in the Important Notes section of the Installation Guide "And, remember that this software can damage or destroy your camera."
I don't doubt it, you can pick one up for less than a fiver and always have it in your bag handy. I just thought I'd mention ML in case he decideed it had features he would use and end up negating the need for a separate one.
ML has loads of features I've never even used yet, I mostly use it for time-lapse.
I see the disclaimer but so far I've loaded it on and off my 5DMKIIs loads of times with no issues as well as a 60D. looking forward to the release for the 5DMKIII.

