Honestly I don't calibrate almost ever, so I should really clarify that my symptoms match my sensor glucose most of the time. I do see the occasional too-fast-to-believe change, but that's usually at the end of a session and either corrects itself or is too small of a change to affect my decision making. I've been on a cgm for about a year, but have been diabetic for 28 and I must admit that my glucose monitoring before the cgm was horrible, so accurate or not for me it's a major improvement. using tandem control IQ closed loop is what has made the biggest impact on my a1c ever.