I have a Libre, a Codefree and an Accu Chek Mobile.
I find each separate Libre sensor to be individual and never the same as the previous one. Like
@Brunneria said, each sensor is consistent so, ignoring the numbers, I can believe the daily variability on the graphs. The actual numbers don't bother me. The next sensor may read higher or lower than the previous one, but will still be consistent so again I can believe the graphs.
The estimated HbA1cs have been laughable.
I did have one sensor that was erratic and nowhere near consistent. It was low. It was high. It threw out silly numbers, high and low. Abbott replaced it.
In many comparison tests, on average, the Codefree reads higher than the Libre and the Accu Chek. The Accu Chek is somewhere in between normally, but closer to the Libre..
My last sensor average (on several comparison tests) was 5.3
Codefree was 6.1
Accu Chek was 5.4