KJ43

Maybe the Garmin SPD-SL pedal is different but I gave the SPD pedals a try and the stack height was so much more than a Shimano pedal and the cleat mechanism was noticeably less smooth as well. I sold them after giving them a solid try and went to a crank based power meter.

I have 4iiii dual power meters on my GRX crankset (Precision Pro) and a 4iiii single left side on my road bike (Precision 3). Both work well once paired. They do go through batteries quickly but just need to keep monitoring and it's easy to replace them when required.

Also, 4iiii has excellent customer service. I accidentally popped a copper contact off of one of my power meters when I was trying to bend them up to increase the contact pressure against the battery. I reached out to their support and offered to pay for a fix but they just said to send it back and then they sent me a new crank with power meter to replace the broken one.