See link below. And of course they aren't going to bad mouth their own product. Our Corp had great luck with them. But the other 1/2 of story is failures due to clamping device. Spend some time researching new clamps. Some are cheap junk and others big $$$. Find the middle ground.
http://www.gates.com/file_display_common.cfm?thispath=Gates%2Fdocuments%5Fmodule&file=Gates%20Fleet%20TT%20433%2D08022%2EpdfJust a little leak can cause major problems
http://www.croberts.com/coolant.htm-hydraulic hose and fittings were only replaced when they broke or badly chaffed. When replaced we took the old line to hydraulic custom line maker and had new one made out of stainless steel braided line. Not cheap but usually one had to replace one time.
-Heater core hoses when they were being replaced, valves were installed in the line so the vehicle was not stranded along road somewhere, other than needing anti freeze, (try to save tow bill if possible)
Hope this helps you