I recently purchased a S86Pro, I like the phone's capabilities, the battery lasts longer than the traditional brands so for that I am very happy.
However, I've been having problems with the speakers, when I try to use them it produces ticking sounds or silence with a zoom, instead of functioning normally. I am bummed by this, I cannot take calls or work. I also had a little problem with the maps app, but it was minor and I think it's fixed now.