Realistic looking. Probably the best, most realistic looking replica (of the SA80, and in general) around. All the real-steel gubbins, like the shiny new rail handguard system fit it.
Reliability - like most of the new ARES stuff. If you get a lemon, you have one hell of a lemon. A 'super-lemon' even.
If you get a working one - its great. Nice running.
Maintenance/operation/modification - if you enjoy getting knee-deep in wires, screws and so on, then this is a fun gun. If, like me, you have an absolute fear of taking apart mechanical stuff, I wouldn't get it (Unless you're happy to pay someone to tinker with it whenever needed).