@Kevin B. , I'm so glad it has worked out for you, and thanks for sharing the way you use it. I like the comment/question part, as sometimes there is a simple question they need to ask before the appointment.
I really think this is the best method, as it effectively screens out anyone that can't seem to follow directions. HOWEVER, I think there is room here for a business to setup something like this, as most investors won't go through the setup that Kevin and I have, yet would like something to set up appointments. ShowMoJo is too expensive for what it offers. I would really like to see something that automatically replies to sites like Zillow, Hotpads, Craigslist, etc in addition to scheduling (this is more difficult than it sounds, since I have to use a combination of vacation response, canned responses with filter through google, and a zapier automation).
I also get a ton of leads now from a Facebook group I set up, called "Northland Homes for Rent" as the area of Kansas City we invest in is referred to as the "northland". It now has over 3K members, and since I'm the moderator, I keep it pretty clean (no advertising for anything other than properties for rent). When I post a property, I include the youcanbook.me link and I usually have several appointments booked from that post. Of the last two tenants I placed in our properties, one found it through that FB group, and the other from the sign in the yard (yes, that still works). :)