skyfi II also caches so it won't drop out as easily. I think my old SkyFi might 'accidentally' break. The SkyFi II also works in the older cradles and boombox.
I'm removing the RF modulator, which actually sounds fine, and using the inputs on my new Harmon Kardon NAV instead so it should be true CD quality.
FWIW- The same nav unit that was optional on the recent Discos is on sale for $1100 OFF at Crutchfield... $399 sale price. It has an aux input if you don't use a changer on it- I never use the changer now that I have XM anyway.