I haven't had any trouble with them; usual process with any company's warranty: First they give it back saying no problem/your fault, then tell them to bugger off and they'll replace it. They just initially try to blame you but call out their BS and they'll shut up and replace it. They told me I connected too many USB devices to my board so it blew up! Told them there are no BS limitations like that and they repaired it. Had a problem with my RT-N16 router where the LAN ports went completely dead and they just gave it back saying it's working fine! Obviously they never even took it out of the box to test it. Took it back and they just gave me a new sealed box immediately. My friend had the traces on his Rampage II Extreme literally catch fire and burn. They told him it's because of his PSU and that he should only use quality PSUs like Coolermaster LOL! He asked them what better PSU there is than a Corsair HX1000 and then they shut up and replaced it.
They have to do this because there are too many idiots who make frivilous/misdiagnosed RMA claims. Even I incorrectly tried to RMA my board once when there was nothing wrong with it.