• Trackpad much worse than on a Mac
• Coil whine
• Bad fan control means it was sometimes noisy in near-idle contitions (though in idle it was very silent)
• there were some flicker issues with the GPU (might have been resolved though)
• one key was bouncy, meaning it sometimes triggered twice
• it woke up from sleep randomly, sometimes while in my bag, often completely emptying the battery
In the beginning it also crashed very often, however this was resolved with an update.
So all in all the quality wasn't on the level of a Mac.
And I wouldn't even start speaking about the OS. If you're used to macOS, it's still such a day and night difference.
Connecting a normal low dpi display to the 9550 with HIDPI display lead to so many annoyances with Windows and all the programs that won't support this for the years to come. I'd barely consider it useful. Although the display itself was quite nice.