I have the RS100 on my gravel bike and it has worked fine. I went with this option because I wanted something that would carry over to my new gravel bike regardless of which drivetrain I ended up with. The Garmin is very sensitive to installation with the correct torque etc. In fact I reinstalled my pedals this week and added an extra thin washer which I think threw off the readings despite being the correct torque.
If I had it to do over again I would get the Sram AXS crankset power meter which would be a cheaper option and lighter overall I think.
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