Yeah, we live in a high theft area of Amsterdam. They also pay total replacement with no deductible. We've actually already come out ahead when my other bike was stolen.
The rate is actually variable based on theft data in the area. It's gone up a lot recently, it might go back down. It was ranging between 68 and 71 for an the bakfiets and a regular omafiets.
Their service is also great. It was like less than a week turn around when my other bike was stolen. It's worth it.
We haven't owned a car in years, so bikes are our primary transport. We can't really afford to be without them, so it's kind of worth it given the situation.
Edit: it also covers bike rental, and it covers damage as well as theft.