Summary of my experience (as I recall it from 18 months ago).
I selected two experts from the website whose bios matched the help I sought and contacted them via the online system.
After months without response I escalated, and only then received responses. One apology because the expert had been travelling and the other had been ill. Understandable, but not helpful.
I had a call with one expert who indicated that they don't actually do any 'work', just provide advice.
In my case the advice was that I was on track.
Unfortunately the service provided no value.