I was primarily struck by the awesomeness of this whole autonomous glucose regulation thing. My last meal is usually around 18:30 in the evening and during the night glucose would fluctuate around 4.5 mmol/l between 4.0 and 5.0 in 1 hour periods, like a crappy PID controller that needs a firmware update. Other nights it would be flat instead of fluctuating, but unfortunately two weeks were too short for a controlled experiment, meal repeats and figuring out what caused the difference. Some nights it would show a couple of hypo's where glucose would drop to 3.5, quickly to be countered by an increase. I didn't notice a thing.

Additionally every morning before my alarm went off, I could see my glucose increasing, most likely preparing for wakeup, all by itself. Amazing!

It gave me a new-found respect for these otherwise invisible processes happening in this fleshy vessel on autopilot with closed cockpit doors. I only got to peek through a small window during 2 weeks.

For me, I found that sleep quality was correlated with my blood sugar levels dipping too low during sleep (which I was able to address by eating fewer low quality carbs during the day).

In general you'll be able to basically see in real time the glycemic impact of all the foods you eat. Which would probably be helpful to a lot of people - you can find all the info online, but having the physical real time stats in front of you makes a difference.

But mostly its what you'd expect. High carb, fast digesting meal -> blood sugar spikes, then drops in accordance with you feeling tired afterwards. Eat keto -> blood sugar is mostly stable.

There's a startup that combines a 2 week FreeStyle sensor with some blood tests, online courses and other things aimed at improving your diet.

https://joinzoe.com/

Now that I know how little the sensor costs, I would say that's definitely the better option...