I did my initial build with this board last night and it's awesome!
Gigabyte Z97MX-Gaming 5
Intel i7-4790K 4.4 Ghz
16 GB 1600 Mhz DDR3
256GB Samsung 840 EVO SSD
Used Clover r2953 (latest)
Yosemite 10.10 from the App Store
Atheros E2201E onboard network working with "atherose2200ethernet.kext 1.0.0" driver
TPLINK TL-WDN4800 Wifi card working out of the box
GMYLE Micro USB Bluetooth 4.0 working out of the box
I'm going to work on the ACL1150 sound card tonight. I did an injection find/replace with Clover, but realized that I skipped a step. Thanks to the original developer for that info.
I haven't tested sleep/wake functionality yet.
Tonight, I intend to walk through the entire process again to narrow down some things I absolutely need. Are you interested in a guide?
The Geek Bench multi-core score was 16984.