I just installed popos on my 13" macbook pro (late 2013), the only issue I had was that wifi was disabled; I bluetooth-tethered to my android phone, and found in the pop-store the required broadcom drivers that needed installation to enable wifi.

since then it's worked well, I'd say the main issue I have is scaling, and I haven't been able to tune the two-finger scrolling to be "maclike", it moves too fast and coarse.