I have been riding internally geared Cyclops power meters for a few years and switched to these this summer. I'm a data and tech geek, but in my opinion, unless you're a pro, 3S is all you need (no 2-way power). I've looked at friends' Garmin files on both sites and that's just too much extra information you don't need for an extra charge. They paired easily with my Garmin 820. Battery status is uploaded to your Garmin Connect account, so you won't be surprised. I've been riding her since the end of June; almost 60 hours and they are still reported as "full lanes". DC Rainmaker states their lifespan as 120-150 hours.
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