Ok guys, this is my pitch for O-Ring chains!
I sell and service exercise equipment and lots of the high end health club stuff uses # 40 chain and of course bikes, steppers etc. What I see happening over the life of the equipment is that, the chain that is well maintained and lubed often needs very little adjustment. Those that are let go for long periods of time need frequent adjustment and they eat the sprockets up! So I conclude that the chain that is let go wears and stretches and eats the sprockets up!
Now when it comes to motorcycle chains I prefer O - Ring chain because unlike regular chain all you really have to do is keep it clean! You do not have to use lubes that attract dirt and sand that wear out the chain. I am lucky because I almost never ride in anything but sand and all I have to do is blow of my bike with an air hose. When I do wash it I spray the chain off with WD-40 to displace moisture.
When I first got my 01 KX5 I was adjusting the chain almost every time I rode it! I replaced it with a O - Ring chain adjusted it once after the first ride and haven't adjusted it since!
Alan
PS I love fact that the exercise equipment manufactures are to cheap to use o - ring chains, It would really cut into my repair Business!