One of the least expensive ways to get power readings for your ride. Very easy to install - just follow Shimano's torque recommendations closely. I use this meter/crankarm with a Garmin, and setup was simple. Power readings show up on the Garmin and feed directly into Garmin Connect, Strava and (likely) anything that can read Garmin data. Note that since this is only a one-sided meter that some data (left vs right power, for example) doesn't work, but if you need that then Stages as a 2-sided version as well.
Great purchase for anyone looking to upgrade their data collection. These really helped me on hills and being able to more accurately dial in my efforts. You will need a pedal wrench to install if you do not have one already. No issues connecting to my Garmin Edge 1000 and Garmin Connect. These will help you see where your left and right legs are in terms of equal power output, and even where on the rotation each leg is peaking it's power! I keep finding new stuff every time I use them. Worth every penny!
After spending a month of research I finally jumped on the power meter bandwagon. As a data junkie I wanted a power meter that is reliable and could generate numbers (along with my Garmin head unit and HRM). Calibrating takes a couple seconds. The payoff comes when I return home and can do a quick peruse of the ride summary. I know it is a long term disposable spider design but as long as I stay on top of the chain wear it will give me years of service with just batteries to replace. If you are looking to build a project bike and have bought into the SRAM universe this is a no-brainer.
Had difficulties with the original unit right out of the box. Gave consistent cadence data but wattage would spike for 2-3 seconds before dropping to zero and staying there. Contacting garmin support was annoying and unhelpful, how many times can they tell you to remove and replace brand new batteries? Was able to jump through enough hoops to get a replacement unit. I had the original receipt within 30 days so i got a new unit, not refurbished. Worked perfectly from day one. Consistent, believable numbers. Hopefully the first unit was an outlier and the new pedals hold up!