I have used both systems with my 9220 4WD. The Universal system was in first and I thought it was great. I had ordered the internal system but there was a delay in receiving all the components, so my dealer put the Universal wheel in (about 30 minutes) The internal system is much smoother, quieter and has quicker response. Since then I have ordered a Universal kit to go in my 4450 (for spraying) and steering wheel adapter kit and wire kit for my Massey swather. The Universal it is around 3,500 CDN, wire harness approx $600, steering wheel adaptor $50. I already own the receiver and display from my internal system. Once you buy the steering wheel, display and reciever, it only costs around $600 to put in other equipment. By the way, I am very satisfied with Starfire 1 signal. It has been within 3-4 inches all the time.