I wanted to provide an updated review of the Sigeyi AXO Power Meter. I’ve had one on my Spark for a few months with flawless results. I recently purchased a second one for my commuter/HardTail for training at work on my dumb trainer. That also has been really consistent and reliable.
I recently did an accuracy test to my Direto X and both were within only a few Watts at all points up to about 380W. Admittedly I didn’t try any sprints or spend long above ~300W as it was on a rest day, but I was pleased with the results. (This doesn’t guarantee my accuracy I guess, but at least all my devices are as accurate as each other).