ok for one I for one know for a fact you can't see recoil from other plays now( no thanks to valve), so now trying to notice no-recoil hacks are impossible.
As for the wall hacks I'll have to review the demo to see, but personal experience I have played with him for a while and haven't seen anything of hacking nature.
EDIT : I'll review the demo as soon as I get back from work this evening.