I used Dunlop touring tires on my four 400-750cc Hondas for years and got 25-30k miles on the rears. My GS500's just weren't happy with those bricks and I ended up preferring sport touring radials on the GS's. Never have allowed myself the luxury of low milage supersports.
Of about 10 different front tires I've used on the GS's, only the old ME33 Laser and my current front Lasertec have worn evenly; all the rest have beveled and/or cupped badly. The Lasertec is now my front tire of choice and I just replaced my Lasertec rear with a Conti Road Attack and it is the stickiest rear tire I've tried.
Think my Laser/tacks may be the ultimate for the GS500's, I am running a 110/80/17 Lasertec with a 150/70/17 Road Attack and they are great! The Road Attacks are advertised as having supersport performance with sport touring life and I can confirm the performance part but it will be next year till I can report on the life.
I really don't expect the 13-14k miles from the rear Attack that I got from my Z2 and AV46 ST radials, but if that Attack goes the 10k miles I got from the rear Lasertec it will be a winner. Here are all the tires I've tried on two GS500's in about 120k miles on them:
http://img.photobucket.com/albums/v443/ ... irelog.jpg
My Road Attack after 1200 miles:
