DCS:A-10 is one of the finest flightsims I've ever played in 25+ years of computer gaming. It certainly is the most detailed one. I've been playing it for a bit over 2 years now and still can't get enough of it. DCS:A-10 with a Warthog Stick, TrackIR and rudder pedals is as close to sim-nirvana as I can get.
And don't get me started on the fun of flying the A-10 online with a human JTAC. Nirvi and the GSPB guys can attest to that.
If you have at least a tiny bit of interest in the A-10 and are not afraid of complex simulations then get DCS:A-10 ASAP.