Works well from my experience and trackers can be worked around to quite some extend with Advanced Privacy and blocking tools alike.
But I would not consider it a real “burner number” as I understand @cliffhanger ’ s request because there’s quite some effort needed to get the number in the first place: you have to officially identify which least takes some time to do so … needs to be repeated every time you burn the number.
I don’t know about other countries and other services but in Germany you won’t get a “real” mobile number without ID’ing towards the provider.
Edit: maybe some day firefox relay will be available for masking phone numbers…