I've been using the Add Clone Sites for WPMU (batch) plugin (updated 4 years ago) for several years (at least 3 years) along with the WordPress MU Domain Mapping (updated 1 yr ago).
I have 8 installs of the above two plugins running about 80 domains between them, so if this broke I'd be in big trouble.
Even though these two plugins aren't updated on a regular basis I've had no issues as I've upgraded through various versions of WordPress (a lot of major WordPress updates).
It's a bit of a pain to setup, domain mapping isn't a simple process, but when setup it works well. Rather than updating 80 sites one at a time I update 8 domain mapped installs, saves me LOADS of time.
Well deserving of a 5 star review.
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