Well, seems you really didn't take the time to understand the logic behind this all if you think 64k max online Slacker is comparible to 192K to 320K local MP3.
I guess my question is, what exactly did you expect?? Harley cannot possibly outperform the existing source technology? I'm not sure exactly what you are complaining about, but if you think Slacker has better quality than the Nano is capable of, you are 100% wrong. If you are saying anything coming out of the convertable system sounds crappy, Um, look at it? Again, what did you expect with 2" speakers? Might be able to do some minor upgrades, but it is, what it is. If you wanted a decent radio, you should have gotten something with the space for the required electronics - Like an Ultra. the entire objective of the convertable was minimalization.
Good luck.