Ask HN: Any previous experience with interviewing.io dedicated coaches?

interviewing.io[1] lets users to practice mock interviews (coding interviews) with peers or professional interviewers. These interviews are anonymous.

They also offer mentorship sessions with “dedicated coaches” from FAANG or other backgrounds. They claim 99% satisfaction rate and 82% of success (landing a job in the desired company). It sounds really vague and difficult to verify due to the anonymous aspect.

Does anybody have previous experience using this or similar services, or an opinion or advice on the matter? I was thinking if this is worthwhile or just pointless - it’s quite expensive.

[1] https://interviewing.io/