@Pete69 I've never used Instant Book, for the obvious reasons of wanting to get a read on guests before approving their booking. But then, unlike a lot of hosts, I'm not that concerned with having my place fully booked- quality rather than quantity is what I'm after. And I have to say, it has worked out well- I can't say I've ever had a "bad" guest, and the majority have been delightful. And basically all of them have taken the time to read through my listing description, they don't just look at photos and prices.
What's interesting is that if we get into an Airbnb discussion (I have a lot of interaction with most of my guests, so it usually does come up at some point) the majority of my guests have told me they would never Instant Book. They want to get a feel for the host they'll be staying with just as much as I want to get a feel for the guests. So while it seems we live in a society now where many people want "instant gratification" and quick and effortless tasks (I recently read a study where about 80% of teenagers said they preferred texting with their friends, as opposed to face-to-face contact, which I found quite sad), there are still plenty of folks out there who want the opportunity to decide based on a message or two with the host. So basically, I'm getting guests whose attitudes and priorities are similar to mine, which of course works out well in a shared home situation.