My ex-FIL used to be an engineer for Gates Rubber. Back then -- say, the 1990s -- they were still mostly US-based and considered a premier manufacturer of belts and hoses, ie rubber products. I think they also owned or made the cases for Optima batts?Don't buy gates products if you have other options. Gates is terrible now. Junk.
Now, like everyone else, production has shifted overseas, and my experience has been "meh." In an attempt to exploit the name (IMO) the present owners (Blackstone, maybe?) are badging things like belt tensioners as Gates. But there's zero reason to think Gates knows how to build bearings for an idler or springs for a tensioner -- and of course it's just all rebadged.
Used to be if a hose was supposed to have an expansion spring, Gates would absolutely have it, ie SBF Windsor-based truck apps on the lower rad hose. Now, it's anyone's guess but the last one I saw lacked the spring. I imagine in mass production it saves quite a bit to not cram a curved spring into a curved hose (honestly, I have no idea exactly how they're built/assembled).
Anyway, all my evidence is weak but I consider Gates to be lower-to-middle of the pack. OK for a beater or a flipper or a basic parts runner, but I wouldn't run it on my mission-critical family truckster. YMMV