I have the G19s, but I really like the simplicity of this one, curious how long that battery would go compared to it's bulkier sibling.
I see it being generally cheap, seems that Zotac mini machines usually are.
I would just like to say that I'm going to get a Corsair 900D tomorrow as I've officially outgrown the Air 540. I have intentions for it though, 4 way crossfire and EK liquid cooling is definitely happening.
A bigger case, on the other hand, generally brings better airflow with it, the size and the amount of fans you can fit inside one will prevent hot spots from forming up while under load, something that's imperative to someone like me running Crossfired 290x's.