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They're good but if you plan on swapping them it's not a 2 minute job as you need to get the torque just right, likewise you'll need a big torque wrench. I guess a 1 sided Vector and a Stages cost about the same. Also I don't really know calibration consistency if you chance the Vectors between bikes.
for power on a track bike you really need a SRM or Stages and deal with the 1 sided-ness.