I second
@Juicyj . I love my dexcom and self fund it. It has a few quirks
1) 1 can't get it to transmit to my watch if my phone is out of mobile range though it still shows up on my phone fine
2) sometimes doesn't work so well in the first 12 hours (don't insert sensor at night)
I almost never need to calibrate it (dexcom support, who are awesome, recommend that you don't calibrate it unless you're absolutely desperate).
I'd recommend you do a trial kit before signing up to an annual subscription (which basically gives you the transmitters free).
It is more expensive than the libre though.
I'm not a pump user so can't speak as to its use with a pump, though. I'm guessing if you do a trial you'll soon see if it's worth it.