I have found bluetooth connections to be a little screwy under El Cap. Mouse, trackpad and keyboard are randomly dropping out. Never experienced before with this hardware.
The 9 update bricked my wife's iPad, which I've never experienced before in quite a few years of Apple product ownership. Luckily it's a work-issue device.
Feel the same. Use Apple Music now 100% of the time on mobile and only fire up TIDAL on the desktop if there's something I want to get audiophoolic over.