This theme went from top of the heap, to not so good in the blink of an eye.
They constantly change the way things work every other update, which sucks because it's usually on the PHP level. So if you're a child-theme maker, they've probably broken something. And what happens when you ask them about the changes? You're redirected to their crappy forums (seriously...who created that searching system?) to ask your question that may never get answered.
And then if you can walk (READ: not take off into the sunset) your way around PHP, you then find out that they've set some type of recursive PHP function traps somewhere within the functions. Ask them what they changed and they will say nothing, although clearly something has. And when you try to dive deeper into an answer, you're met with "...customizations are beyond the scope and resources of these support forums...".
They make it so you need to buy their pro support or the pro theme. Why not just get rid of the free theme and charge if you're not going to have any thorough documentation.