Calibration fine tunes the scanner, it’s a really easy app that is developed by the manufacturer to dial everything in. It really isn’t difficult at all, you just open up the app and move some things around until the colors overlap. I don’t think it’s user error as much as dealers might not take the time to do it. I haven’t done tests on how scans before and after calibrations differ, but one point to make is that the calibrator wasn’t even put into my hands until 200-300 scans in, and those scans prior still came out great. A good boot fitter will know what a proper scan will look like, and won’t let you put your shoes back on until they are 100% satisfied. I can do it in one try after doing so many fittings daily, but I encourage newer fit centers to not shy away from telling customers “that wasn’t a good scan, let’s do it again”. It’s possible they either don’t know what was wrong or don’t want to seem inexperienced, but this is a crucial quality control step when a perfect boot is the only important outcome. True dealers were all sent brannocks months ago, which should always be used in orders. This reinforces information supplied to True, and can also alert the factory to any possible scanner issues before a pair is put into production.