Refurbished Batteries, Good or Bad?

TheMadReaper asks: "I recently had to replace my laptop battery and couldn't decide whether to go for a new battery or a refurbished one. The refurbished ones are sold at a lot of places, but then I ran across this article that claims that refurbished batteries suck. For sure a bunch of you out there have tried refurbished batteries. So tell me, are they a good buy or a scam?"