keep in mind, it doesn't matter how reputible the brand is, or how high their quality is, ALL manufacturs have electronics that go bad, sometimes a few minutes after install, sometimes a few months. The question is, when you buy it off ebay, are they going to help you when they go bad.

Speakers are pretty basic though, usually if they work out of the box, their going to work for many years to come unless you send distorted sound through them (common) or severly overpower them (not so common).