It's let me down a ton. Deliveries, contractors, maintenance people, doctor's offices with a last minute appointment available, and so forth. Fortunately never for a true emergency, but that's also something to keep in mind as well.
There are lots of things that people simply don't leave a voice mail or text because if they can't contact you immediately, there's no point. Or if the contractor can't get you on the phone, they'll just move onto the next home and skip work on yours that day or that whole week.
So it's not win/win. It's very much win/lose.