Since my bike is new, I only used the power meter side left crank arm from this kit and will be keeping the chainrings as a backup for when my existing ones ever wear out. Aside from that, the power meter works like a charm. Paired right up to my Garmin allowing me to do a calibration before every ride. I am now able to train using power metrics.
A solid produce with what is, objectively, an easy install. Be aware you are going to need to change your bottom bracket (likely) to use SRAM's DUB BB spec. It is an extra wide axle and needs that BB to fit appropriately.
The software is am easy download and updates the firmware whenever you open it. Power measurement is accurate and reliable.