Beenthere,
Indeed their is something special about the JD iMatch hitch. It conforms exactly to all of the ASAE and SAE hitch dimension standards. Most of the other brands mentioned do not. For example, they may have the correct width, but not the correct mast height.
Midwest is another of the quick hitches that is built to the standards.
Then if you stick to implements made to the standards as well, you will be assured that you can hook up without having to get out a torch and welder. Some examples of manufacturers that follow the standards include: JD, Frontier, Woods Estate Series, & Midwest. There may be others as well.
JackIL