i really don't want to deal with ebay ones as i mentioned before if these fail prematurely i can just drive down the road and return them no waiting no hassle and no egay.
I guess if they say sylvania on them you would be ok. But just so you know, the US CANNOT compete with Chinas prices, So I would say that a good %70-80 of the leds available in stores and such are actually from china, just repackaged and under a different brand. The only company that really knows its stuff is Phillips, there leds are nuts expensive though.
for me I have been a Ebay Led guy since day one, and I have ordered anywhere from 100-200 leds, both component and plug and play. they always work, and are always bright. but like others have said, its really hit and miss.