The Starmate 5 is WAY better and less $ than the Starmate 8 in my opinion. However I'm pretty sure the Starmate 8 may use the XM Xpress Docks. If that's the case it's a good transition radio. So if someone gets that and say the radio dies in a few years it should be easy to replace with say an Edge or something and not have to change docking stations. But that's assuming the Starmate 8 uses Onyx/Xpress docks, which I hope it does.