Anyone tried Amazon's "Renewed" subs?

I want to spend a little under $500 for a pair of 8in subs. Been Browsing and these Arena 8's have great reviews/responses. Unfortunately they are like $400 a piece. But I see several jbl and others renewed for half off. Considering some people just buy stuff and return it all the time without even braking the subs in i was thinking maybe these might be good? Looking for anyone to give me their horror or win stories from amazon renewed items? Or if you know of a better pair of subs under $500 chime in.