Dell Inspiron 5558, Sierra.
i3-5005u, Intel HD 5500, GeForce 920m, 4gb Ram.
What Works:
Battery Indicator
Display Brightness Slider
Graphics (HD 5500)
Keyboard
Touchpad (basic operations)
Webcam
iMessage, FaceTime
Sound (by VoodooHDA)
Ethernet
Fn keys
What Doesn't Work:
Multitouch gestures (Don't know manufacturer of touchpad)
Power Management
Don't turn off by pressing ON/OFF key
Wireless (Qualcomm Atheros QCNFA335)
Experience in this business is small, install the system for the first time.