To Dexcom Or Not To Dexcom?

It is expensive that's for sure........

you could try and get a Libre prescription and then just fork out the one time payment for a bluecon or maio maio reader.....which will take readings off the Libre every few minutes and send it to an app of your choice...

there will be notification options for high and low etc....

I haven't any personal experience but I am aware of the devices....

I used the Dexcom G4 for the longest of times. In my opinion, it made living with T1D 10x easier. If I was ever concerned about my blood sugar, I would simply look down and see what my number is instead of having to poke my finger and check. It is very convenient and helpful. Identifying trends is also a great use for this. After meals, exercise, stress, almost anything, you can see what your sugar levels do. This helped me balance my blood sugars by making adjustments so they aren't all over the place.
Now the sensor is supposed to be replaced every week or something (I'm not sure), but I could make the sensor last about a month before it ripped off. This saved a lot on supplies.
Having the convince of just knowing your sugar all the time is super nice. Seeing the trends also improved my health.
Hope this helps a little.

I tried Dexcom and Libre.
Sure there was some value from both but I didn't find either very accurate so the value to me was the trends rather than the absolute values. I was able to work out which foods spiked earliest (so learnt to take my insulin earlier), what was happening during exercise, etc.

The DexCom can alert when your BG is too high, too low, falling too quickly or rising too quickly.
Some people have "pimped" their Libre to do something similar but this requires additional tech.

If possible, I would recommend getting a trial before making a long term investment - some people find them great, others find them inaccurate or irritates their skin.