Halo Reach is available for backward compabilite
I know I tried it last night…
I am glad I kept my 360. Have been reading about a lot of issues with the Reach backward compatibility. I recently bought O.D.S.T for the XB1 and graphic wise, it sucks. I don’t expect much for Reach.
Haven’t played it yet, but I’m really disappointed to hear all the negative feedback so far. 
Guess I’ll find out when I get home this evening.
its been great for me other than the frame drops in very explosive and spartan heavy areas