I have a Speeco Cat 1 Quick Hitch. Bought it from Tractor Supply. It works very well on my 3510 with my box blade,mid buster and shredder. Can not use it with PH digger. I have not had any problems changing from one implement to another.
I got the Pat's Easy Change (Cat II) for my 6000. Works good. One guy can put on/take off a 7ft rotary cutter in a couple of minutes. About $220 deliveried to my door. BobG in VA