Pajoube:
I agree with MossRoad that the plates are probably not overpriced. I bought two extras, one to go on the 4-N-1 bucket that W.R. Long is making for me, and the other to use for miscellaneous projects. I will probably put a 2" hitch receiver on that one, and then use that to attach a number of other things, such as a winch, etc. I also probably will get another separate plate, however, once I convince my brother he will never fix the old Datsun fork lift he has, so I can remove the adjustable fork assembliy and put the plate on the frame.
The plates aren't cheap, but after unloading five implements from a trailer, and then hitching to each a second time and stowing them in a shed, all in a little less than an hour, I will say to anyone that the quick attach system is more than worth it. If it had been 3-point stuff, I would have had to hook a rope or chain to each and lift it with the bucket. As it was, I actually could have used each piece of equipment last night, not just slung it off the trailer.
Power Trac implements already have the plates on them, of course, so you only have to get extra ones to tinker.