I don't think I have seen many reviews of it here => not too many people do it.
I guess if you go to WDW with (small) children, this is something you don't book. It's also not cheap, and more something for real Disney fans (let's admit it, most people are not as much into Disney as the people from the DIS).
I wondered the exact same things when I wanted to book my two tours and my Spirit of Aloha dinner show.
Since the tours have limited capacity, I thought I was going to be way too late. But no, there was still availability!
Good luck getting the ADR, but I think it won't be too much of a problem!