I know there are pros and cons to running this tire, and I've been on the fence for quite a while as a result. I'll run this for a while, and if I end up hating it, I'll pull it off and put an Avon tire back on, as I have been running for a long time.
Part of the decision was due to the fact that Avon has stopped making the Avon Venom, a tire that I have used on my Goldwings for many, many years. The only Goldwing-compatible tire they still make is the Avon Cobra, and that is what I just installed on my front tire.
I went to pull the inner fender flap forward to give the tire adequate clearance, and when I did - the whole thing came off in my hand! The small 1/8" rivets holding both the flap to the bracket, and the bracket to the inner fender had both given out. I drilled out the rivet remnants and reinstalled it with new rivets.
The one thing that really caught me by surprise is the fact that when on the center stand, the rear tire no longer clears the ground - both tires contact the ground when on the center stand:
This is going to take some getting used to - I'm used to being able to rotate my rear tire when on the center stand to inspect it, and to easily access the schrader valve to adjust tire pressure. I may end up leaving a small piece of wood in my garage to put the center stand feet onto.
A side note: when I called up my friend to let him know that I had some new tires, and to ask when would be a convenient time to stop by to use his tire machine to demount/mount the tires, he told me, "oh, sorry, I sold it last month."

So instead of 15 minutes with a tire machine yesterday, I spent hours with a set of tire levers, sweating it out. I haven't done that with motorcycle tires in many years, and WOW, the GL1500 rear tire goes on there tight! I'm definitely feeling the exertion today...