Been using these for many years, and am a big fan. They are very strong and keep constant tension on your load. For tying down soft luggage, or nearly anything else to your bike, they are superior to anything I have ever used, and that covers over 40 years of motorcycle travel.
This past Friday, I was strapping down my soft duffel to my Tracer, and noticed that the elastic had pulled away from the buckle end of two of my (over 12 year old) 60" straps; the nylon was intact, and appeared to be strong, but I used another, newer pair that I had instead.
On return from my trip, I contacted the company, explained what was going on, and they are sending me a brand new pair!
When they say lifetime guarantee, they mean it.
ROK Straps