This; is what I was hoping to see here. Even though it is not first-hand experience, confirming what I have seen on the Spyder Lovers page is a good start. Most everyone over there is a little biased as they all own Spyders. It seems to be difficult to find conventional trike (two wheels in back) owners who have ventured over to even test ride a Spyder. I'm considering a test ride on one to compare it to our Spyder to see for myself, but the local HD dealer is pretty touchy about test rides. Of course, being a BMW guy, my first choice for such a trike would not be an HD but a conversion of a Goldwing or one of the beemers.
As for the earlier comments about handling, that was only asking about comparing trikes to trikes and not trikes to bikes. Having ridden bikes since 1968 and currently in possession of a few BMWs, there is no comparison of those to the Spyder. The two wheelers are leaps and bounds better through the twisty roads than the Spyder. Even the '79 R80 eases through curves that push the Spyder to the limits.
Thanks for the input Jim.