Let's see. I've basically only bought Asus my whole life:
Asus P5SP4 (buggy IDE controllers, CMD640 chipset ) Pentium-66
Asus P55TP4 Pentium 90
Asus P55T2P4 Pentium 133
Asus P2L97-DS dual Pentium II -266
Asus P2B-D dual Pentium III 450
Asus CUBX Pentium III 800
Asus A7M266 AthlonC-1333
Asus A7N8X-VM AthlonXP 2500+
Asus M4A78T-E Phenom II X2 550
All of the boards, when retired, usually 10 years after they first went into service, still worked perfectly fine. Yes, I have a few gripes about Asus' BIOS and software quality over the past few years, but hardware-wise, their products have been rock-solid, despite well known problems with other brands, particularly, with capacitors.