There's just one reason for me to get A-10A, and that's that I was a huge fan of A-10 Attack! and A-10 Cuba! back in the day. They really got me into flight sims, and I've been playing them up until I finally moved on from Win XP last year and could no longer launch the installer. I'd certainly fire them up often, if I could get that figured out in Win 8.
Weapons control was pretty ambitiously modeled for the early 90's, even from Attack!. It had a fairly clickable cockpit (hint, hint...)! No communications, little control, simplified autopilot/navigation--and a startup procedure on the scale of A-10C is certainly not included. Also--since I cannot say I've ever flown the A-10--compared to A-10C and A-10A, its flight characteristics are much better (more maneuverable, more power, harder to lose control of at high AoA).
It seems my simming is based around the A-10--got my last two new computers for it (1999 and 2013) and in both cases ended up getting joysticks designed after the respect A-10-model (Thrustmaster X-Fighter (a B-8 design) and Thrustmaster HOTAS Warthog).