I have the Acer XK tour irons with TT Dynamic Gold shafts, and they are excellent irons, Distance is very good and they feel like any ohter cavity back set of irons on impact. Hard to say if they wourl improve YOUR game, as it depends on what it would take to improve your game. Also depends on what irons you have now and how they fit your skill level.
I've got a set of XK Pro heads sitting here with no shafts. Haven't decided to reshaft them or get rid of them. I bought them on a whim and don't really think they're better than anything I use right now. I guess I should re-shaft them and see.
Angel; Why not build up one of the heads with a shaft you know you like? That would tell you if you like them or not, and by using a shaft you know you like, you don't have to worry about the shaft not being a good fit for you. The Acer XK Pro irons play very much like the Callaway X-22 Pro irons, so you could try out the X-22 irons if you don't want to build up one of those heads sitting around.