There are a couple of in-depth threads here on HN discussing the different companies you mentioned.

Here is one in particular that includes some people sharing reviews, plus Optery's CEO going into detail on the different data removal companies: https://news.ycombinator.com/item?id=30605010

If you're interested in these services, a good approach is to sign up for each company’s free scan and compare the results.

Full disclosure: I am on the team at Optery