What surprisingly isn’t an issue with power meters is accuracy and reliability. Some brands claim a +/- 1 per cent accuracy on their more expensive meters and +/- 2-3 per cent on their more affordable meters. Either way that’s more than accurate enough for tracking your training and as long as it’s consistent and repeatable, the actual numbers don’t really matter beyond boasting. The claimed accuracy almost always tallies when tested against other meters too. With self-calibration and temperature compensation built into most meters, they’re super reliable and remarkably consistent for such a sensitive, high tech piece of equipment under so many different loads and stresses.