The '89 model was the last 500 model that Honda put any development into, it was the first to get a low-boy pipe and USD forks. There is almost no difference from a 1989 model to the last bikes built in 1998 (yep, even the 2002 models were put together in '98).
They are sort after in OZ because Honda sold bugger all here in 1989 thanks to the recession & 500's starting to lose there relevence, but they are a great bike for Pre 90's and a lot of guys want them to build Leisky replicas.
So no there not really the Ducks Guts, in fact I remember when they came out that everyone bagged the suspension as the worst ever, There was a quote in one of the magazines along the lines of "the forks are only any good if you plan on jumping the snake river canyon or weigh 300 pounds" but it was all easily fixed with springs and valving
I just wanted one because I reckon they were the best looking 500 model made..... and I'm close to 300