i've been using an old linksys wrt54gs (supposedly with speedbooster) for the past 3 years, non-stop, 24/7 literally speaking hehe. the only rest it gets is when there are power outages. i guess i'm just lucky. a whole batch of wrt54gs had connection problems.
i was on the verge of getting another router though, a few months ago, and it was a toss up between the dir-655 and the belkin N-1. belkin gets the nod when it comes to aesthetics but you've got to give credit to dlink for churning out such a performer in the 655.