Power2Max power meter cranksets have been updated to add left/right power balance measurement.
They’ve also spruced up the hardware to better calibrate against changes in temperature. The latter was a known (and admitted) issue that they say is now fixed. UPDATE: Current users can send their cranks in for an update. Cost is $50 and covers return shipping.
They also told us they have some contracts with other companies being finalized now that’ll be announced soon. We read that as they’ll have more chainring compatibility options soon, but we’ll know for sure shortly. Currently, they only offer power meters for SRAM S9000, Rotor and Lightning cranks.