Don't know much about the Reichardt system other than it will use your GPS for guidance when the sensors aren't "active"(going through ww's ect.), and you don't need to install a large amount of wiring to make it work.
I've run the Headsight truesight system for 2 yrs now and it has performed very well once it was calibrated. Down fall is install takes a bit of time, but is fairly easy. Also, headsight's customer support is second to none, but they were recently aquiered by AGCO via precision planting so hopefully customer support doesn't drop off.