Do people who ask for anonymous feedback via admonymous.co actually get good feedback?

I’ve seen quite a few (assumably pretty online) people ask for anonymous feedback via this website.

I’d be interested to learn from people that use admonymous.co whether;

1. They actually get feedback
2. Whether it is useful feedback

I send a message to the top 40 people I interact with every six months asking for feedback on (anonymously);

1. What is one thing I should stop doing, or do less of?
2. What is one thing I should start doing, or do more of?

I am wondering if getting feedback from people I don’t know well is worth it, considering the effort I’m already making.

[Question] Do people who ask for anonymous feedback via admonymous.co actually get good feedback?