Has anybody used ride-on tire sealant?

[nerfboy]

Have you used ride-on tire sealant?
http://www.ride-on.com/prod_mot.asp
What do you think of it?  Share your experience.

I got a nail in my tire last week.  Replaced the tire, but it got me thinking about preventive measures.
These guys have some pretty big claims.  Besides stopping leaks on the fly, they claim longer tire wear, wheel balancing and even “bikes actually run smoother at speeds as high as 150 mphâ€￾

 

[Warputer]

I used fix-a-flat once but never this stuff . Sounds almost 2 good to be true !

 

[Professor]

Things like that scare me in a car. Even more so with my motorcycle.

 

[300Busa]

Ever taken a tire off a rim that had that crap in it? Not a fun job.