I had a chance this week to put about 50 miles on my wife's 2010 SG. Yes, the stereo is nice. Amazing in fact - it seemed to magically keep the right volume whether I was stopped or doing 70 on the interstate.

Overall, it is largely the same bike as mine, a 2009 Road King Classic. Same motor, tranny, chassis, etc.

That said, I cannot wait to get back on my RKC (in for the 10K mi service). The handlebars fit me better (stock on both bikes) and I like the higher position of the RKC. The SG is low - exacerbated a bit by the Reach seat my wife has on the bike. The SG just feels smaller, and not in a good way, not to me. I am 5'11'' and about 160lbs, so not a big guy at all. If you are 5'8'' or lower, then I can see wanting the "smaller" bike. For anyone else though, give serious consideration to a RK.

For me, it was the difference in riding in a Honda Civic or Honda Accord. There is just more room in the Accord, yet you are very comfortable.

 

The Road King is awesome for its versatility. I am actually looking real hard (actually as soon as funds permit) at getting a detachable fairing. If I could afford another bike it would be the UC but I will never part with my Road King!!!!