At the small show our club did last week all "knock off" 3pt systems were represented. My 630 had the eagle hitch, there was an AC WD45 there with the AC Quick hitch. The Framall 300 row crop and utility had the IH Fast Hitch and the 200 had the 1 pt version of the fast hitch.
No one brought a Ford or Ferguson even though several guys in our club have them. Would have been nice to have all represented but most of the lookers probably wouldn't have noticed or known anyway.
I was looking at them and thinking how versatile the Eagle hitch really was. The others would not couple to the Ferguson style tools without adapters but the Eagle hitch would connect to 90% or more of any Ferguson type 3pt equipment with only reversing the hitch pins or maybe no change. The only thing I am not sure would work right would be a 3pt plow since the Ford/Ferguson hitch floated a little left/right where as the Eagle hitch plow itself was designed to float a bit from side to side.
Sorry for the long post, just an observation I made seeing them all side by side on Saturday.