I've never had any problems with ecs. Asus may still have good support in the form of bios updates. Most board makers outsource some of their boards to other companies. There are only 2 or 3 large board makers left.
It's a matter of build quality. OC performance and board lifetime. I've had more than one Elite board die on me within 3 months time. Anecdotal evidence, but so are the three bricked Xbox 360's I've got in a pile.
Well, RAM and PSUs are in much the same situation. As oldie pointed out, there are only so many large board makers. Same is true for RAM chip makers and also the case in the power supply market. It will be interesting to see if ECS gains credibility and clout in the markets or if ASUS loses face through it all. OCZ is not even a chipmaker and through positive marketing and creating 'image' the company compiled enough leverage to buy PCP & C. Marketing and' image' are all important today more than ever before.
Nothing "new" here. ASUS has used ECS as a contract backup or "second source" for several years, when ASUS couldn't meet peak demand, to either produce or design some of its low-cost boards, or when ASUS needed to take some of its facilities off-line for upgrades/re-tooling.