I have used lets see, 5, Amptron/PC Chips/ECS mobo's, and I have not had any major problems with any of them. The ones I've used are the Amptron PM8600 (I think) Socket 7, PC Chips M779MR (SiS 630S, Socket 370), ECS K7VMA (VIA KM133, Socket A), K7S5A, and P5SJ-B (SiS Int. Video chipset, Socket 7 66fsb). I have had no problems with any of them
I will comment on the problems with K7S5A that you absolutely must have a good powersupply, especially when using high powered cpu's like Athlon XP 1600+ and up. You can get away with a poor ps on say a Duron 1.0 but if you're running a high-speed CPU, u must have a top quality 300W ps from Antec, Sparkle, Enermax, or Enlight.