The Tech Report has an excellent round-up of small form factor H55 chipset mobos that compares offerings from a number of vendors including GIGABYTE. Here are some good quotes:
“Gigabyte has scaled the motherboard market in recent years and is now on relatively equal footing with long-time industry leader Asus.”
“Why pay that much more for the (other mobo) when the Gigabyte gets you roughly the same feature set and performance for just $110? It's not like the H55M-USB3 is just cheaper—it also serves up a second physical x16 slot, RAID support for two SATA ports, and a DisplayPort connector for integrated graphics. The H55M-USB3 is more power-efficient than the EVO at idle, too, and it's nearly as good an overclocker.”
Read the review conclusion here.