Is it worth it? I would say yes, but then I've had it free on NHS prescription now for four months.
I've gone through several stages in using it, and made a number of changes based on the data. It can get a bit obsessive, but on the other hand my blood sugar didn't go above 7.8, or below 4 yesterday. It was lovely. I'm expecting a few more days like that too.
It does take a while because I found I was making step by step changes, and sometimes one change would mess up another bit, but over time, my blood sugar control has definitely improved.