Larry,

I've had two of the Silverleaf VMS 120's and they were great. I had these on plastic CC's and if I didn't have Pro Driver now on my Liberty, that's the way I would go. The 120's are kind of the bottom of the line, so you can buy the latest and the greatest for a series 60. The information they provide far exceeds the Pro Driver. I bought the Silverleafs and installed myself, very easy hooking into the data port.