I saw a mix of results with dealers using Marketplace, but almost all of them saw a large overall volume of leads.We get several of those of course, but we have very good success with Marketplace. Especially since we have our chat connected to our FB page. I also thinks it helps that our salespeople handle all chats. In February and March Marketplace actually outperformed our 3rd Party Listing sites.
Part of the problem was that Facebook made it one click to say "I'm interested" in a car, which lead to countless leads where the customer never replied after the initial communication.
This move makes alot of sense to me up here in Canada. We used to have Kijiji (eBay Motors-ish) and it was the hottest place for consumer to consumer car deals. They saw the money and added dealerships too and made it too many steps to view only "private" listings. Once Facebook did the same, we really have no true consumer to consumer marketplaces left for cars.
I'm curious to see how running ads on the Marketplace through an inventory catalogue is going to work - I suspect the results will be vastly lower than real listings.