I have two Asus MB's both 1150 series which have Win10 drivers available, namely Asus Hero VI and Asus Z87 Pro.
I noticed not many Asus 1155 MB's have Win10 drivers available. But this one does
http://support.asus.com/download.aspx?SLanguage=en&m=H61M-CS&p=1&s=39&os=45&hashedid=tASslMAZsa2TsqV...Anyway, I also have an Asus Laptop N56DP which only has W8.1 driver to this day on
Asus Driver Support site http://support.asus.com/download/options.aspx?SLanguage=en&type=1I am going to test my Asus N56DP laptop on DAY 1 of Win10 upgrade launch after I've already checked the Windows 10 Compatibility Test seen here:
http://www.zdnet.com/article/will-your-pc-run-windows-10-use-this-well-hidden-compatibility-checker-...My Laptop N56DP is only a backup which passed the MS compatibility test.
The Win10 drivers offered by Asus for my two other MB's are pretty important. Intel Chipset, LAN, Bluetooth, Audio, WiFi, RAID/SATA
If this is a critical system, I would wait, see and listen before upgrading to Windows 10.
Corsair 500R Case, H110 Hydro, 1200AX PSU, Asus Maximus Hero VI MB, Intel 4770K CPU, Gigabyte GPU GV-N98TWF3OC-6GD, G-Skill Trident 2400MHz 32GB, Crucial M500 960GB SSD, Seagate 6TB HDD x2, Creative SBZ to Denon AVR-4311ci - Infinity Primus 5.1 w/Klipsch Sub XW-300d, HP ZR30w 30" S-IPS LCD, W10 64bit