£150/mo for each? Do these receptionists actually answer? Has he "tested" them with test calls? Any recommended site to get this?

No - £150/mo for the service. I asked him and he said they take the calls, write up notes and he handles the callbacks/etc himself.

I don’t know if he’s “tested”, but he said he’s happy enough with the service. We don’t always have to AB test every possible option - sometimes good enough is good enough.

Well presumably 150 is what you pay to use the service, and they have like 100+ companies using it.

The model is exactly like Planet Fitness or similar gyms: It doesn't work if everyone visits at once, but you plan on most people using it once a week.