
The Silverwing is definitely more roomy, with a bigger saddle, but I'm just as comfortable on it on long distances as I am on the PCX. I'd take the PCX any day of the week at speeds under 55mph -- it's more nimble, twice as efficient, and more fun. Don't get me wrong -- I love the Silverwing and will probably commute with it once my wife gets knocked up and I start commuting by myself, but I'll ALWAYS keep the PCX for around town riding. We might even sell the Silverwing, just because I've been riding the PCX more than it recently.
In the twisties, I have just as much speed and confidence on the Silverwing as the PCX. The suspension is much more substantial on the Silverwing, which helps on shitty roads, but the massive amount of weight is a strike against it on shitty roads.
Honestly, if the damn thing got 70mpg instead of the 48mpg I'm getting, I'd like it a lot more. I just somehow can't get over the 50mpg difference under the PCX. It saddens me. It's a great bike, but at 48mpg I might as well have gotten a damned Goldwing. I'd get the same gas mileage, but I'd have a whole shitload more bike and a whole shitload more comfort.