OK, guys, it's official.....I have gone to the Darkside on my '08 GL1800. I had the Michelin Primacy mounted on the rear @ 36 psi and Bridgestone Battlax on the front @ 38 psi. I haven't ridden far on them yet, but so far I can't tell a lot of difference in handling. It seems just a little different, but not better or worse, just different. I'll know more in a couple of months and a few thousand miles. Thank you all for your insights, explanations and information. Ride Safe!