I bought two codes and felt this was a well-done app and perfect for my use case. I currently have it on my contact page and have plans for a couple of other locations.
But I've discovered that the load time on mobile for the javascript for the calendar is 7-9 seconds - that's AFTER my page loads - in other words, just waiting for the BLAB javascript. It's not my site - I have a 94 for mobile in Google Page Insights and very good metrics with the GTMetrix, Pingdom, etc.
I fear users will bail after 3 or 4 seconds.
I cannot recall another bit of javascript that takes this long to load.
I hope that the BLAB folks can assure of us a plan to get the load time down to something reasonable.