I just had these professionally installed. It took 3 hours and was a bit challenging.  My installer was frustrated because the doors came with the wrong bi fold door wrench. So he had to trouble shoot. Also, the trim piece that was sent for the top gap, is just a flat piece of wood with peel & stick adhesive. The trim piece didn’t fit because of the existing frame. I am having a different piece of trim installed instead. 
Overall the doors seem pretty nice. They had a few fine dent scratches on them. However, I have learned nothing in home renovation is perfect. Overall, the doors are nice for the price I paid.