I've had excellent results with the Shimano narrow chains for my 3x9-speed commuter over the years. These chains perform for extended mileage, I typically get 8000 miles for a drive train with Shimano chains during year-round commuting. I'd like it if they came with more than one connecting pin, or packaged together with a quick link, but those are available separately.
Upgraded 2004 Ultegra 9 spd rear der. with Shadow 9 spd rear der. & needed chain32 tooth cassette. Both the chain and cassette are from BTD. Both products are Shimano XT compatible with Ultegra. park. Easy swap from Ultegra to XT components.
This chain works with my 9-speed road and mountain bikes. It is strong and durable. The pin system is easy to install. I have always been happy with Shimano components.
I bought the bike used with the chain already on the bike. I do not know how many miles it had on it when I got it. I have put 10,000 miles on the bike with the chain with routine cleaning with Simple Green and lubing with Purple Extreme with less than 34% wear indicated using chain measuring tool. I clean and lube every 400 miles or so and more often in wet riding conditions. Main use of the bike is road rides.
I highly recommend this chain.