Hello,
I work at company where we currently have over 1200 stores world wide. ALL of our stores' servers are ASUS, VIA based motherboards with 1.4Ghz T-Birds and 1GB Memory. We used to have Intel Seatle 440BX-2 boards out there with PII and PIII's. There haven't been just as many problems with these boards as there was with the intel boards. Overall everything has worked very well. Stability/Performance has been very good. The real issues here is price. It's still very hard to get a comparible P4 based solution that is equally priced.