An update....I have now heard from various sources, including my endocrinologist, that the Freestyle Libre tends to read a bit lower than a finger stick usually. This has been my experience.

But if you want to see an overall continuous pattern or see what certain foods do over a period of time, it works well for that. The Dexcom CGM is much more accurate, but way more expensive. That is one of the meters used by Type I diabetics where the extra accuracy is worth the extra price.