Just added Pat's Easy Change system to our Kubota MX4700HST. I'm mechanically avg, and it took longer than some others report to install the system. The shims were easy enough, but getting PECS square using the stop screws proved challenging. In fact, they still don't look quite right to me.
That said, I couldn't be happier with this addition! I hooked up the Landpride rotary cutter, including PTO, in about 2 minutes. Back up, lift, and voila! The lower arms are done. Even more a blessing is UNATTACHING an implement. That's always been my biggest headache; not with PECS.
Only implement that was a problem was the Eagle 7' landscape rake. The lift pins were too short; with bent washers installed there wasn't room for PECS. But local hardware store had longer pins. Problem solved for <$10
If you're considering buying Pat's system my advice (worth what you're paying for it) is don't hesitate. Buy, install, and enjoy changing 3pt implements!