I find that the Libre isn't consistent over time, and often lulls me into a false sense of security.
My latest sensor was spot on (amazingly) when I checked it the first day of activation (24 hours after application).
A week in and it was reading around 1 mmol/L low consistently, which was making me feel like I was doing really well. But wasn't.
This reminds me that I should check it again; 4 days left.
Edit: this time a 6.2 against a finger prick of 6.7, so not so far out this time. I really need to find a time when my BG is absolutely flat for half an hour to test properly.
[Small grumble; every time I add a note to the reading for my logbook in the App on my Samsung phone it refuses to accept "finger prick" and keeps substituting "finger pick". Haven't worked out if it is Samsung or Abbott driving this.]