As a track sprinter, 5% for peak power could be a massive difference so you're kind of shooting yourself in the foot here. It once again boils down to 'the particular rider being happy with x error margin at x price point'.
I don't use that bike for max power efforts - it's a winter bike. The shortest effort I will generally do on it is 5 mins... But generally it just get used for loads and loads of z2 or Z3 work.
If I want to measure peak power I will use the p2m on road or Powertap on the track.
As a track sprinter, 5% for peak power could be a massive difference so you're kind of shooting yourself in the foot here. It once again boils down to 'the particular rider being happy with x error margin at x price point'.