Let's not forget that Mir acts as a system compositor in Ubuntu. This does one important thing: it allows them to get rid of VT switching, which is ugly and problematic. Here's a very good article on system compositors and VTs: http://dvdhrm.wordpress.com/2013/07/08/thoughts-on-linux-system-compositors/
From the end user standpoint, if you've gained a system compositor, LightDM can now be used as lock screen, user/session switching is much smoother and you can now run several concurrent sessions in multi-head setups.
P.S. this blog doesn't work with Launchpad OpenID for some reason. I'm https://launchpad.net/~shnatsel
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From the end user standpoint, if you've gained a system compositor, LightDM can now be used as lock screen, user/session switching is much smoother and you can now run several concurrent sessions in multi-head setups.
P.S. this blog doesn't work with Launchpad OpenID for some reason. I'm https://launchpad.net/~shnatsel