I think Trimble has the best unit,but this is my personal feeling as I have ran the other system and found this to be the best.Now I run 3 EZ steer systems with tilt and the new 500 monitor,I have this in my 2004 STX450 and seed @ 6 MPH with 64 feet and it never wonders more than 2-3 inches off line,as for spraying I have a unit in a Spx 3150H_C with 90 foot booms and around 18MPH it has a little wave in the tire tracks,but if I slow down to 15MPH it stays on line very good,as for theWDX 1101 swather with a 36 foot Honey Bee I never sceen a system work this good it is all most perfect in this unit,as for the unit going in to other peices of equipment after set up and a quick write down of setting for records it takes about 10 minutes to move around.