I can't give you any longevity reports, but I just put a Bridgestone Driveguard Runflat on my B a month and a half back. I'm really liking it. I only have 1100 miles on it so far but I can't tell any difference between it and the stock mc tires that came on the bike. It leans over very easily.

It was only 106 bucks at a local tire store(Flatsos).

Ratings on it seem to be pretty good but the few negative ratings say it doesn't do well when it hits a deep pothole...as in destructs in a couple of cases.

I DO have FOBO tire pressure monitors on my bike. Might be the best 100 bucks I've spent on any accessorie. I want to know when I'm losing tire pressure while riding. If the TPM system gives me 4 seconds notice, that could be enough to scrub a lot of speed off and save my hide.
When running a Runflat, it is highly recommended to have a TPM system.

Here's the new tire mounted.



Scroll to the bottom of this page to see the ratings. They're very good for traction, etc.
http://www.tirerack.com/tires/tires....del=DriveGuard