I think another person on this site once pointed out that they like refurbished lenses because they know they've been checked out and brought up to specs individually, while a new lens may get only a cursory once-over on the production line. I don't know if that is true or not, but it makes sense to me.
On another topic:
15% would be an even better bargain if Canon would not slap sales tax on the final invoice value... BH/ Adormama etc are cheaper cause they don't put sales tax on top when shipping to Indiana.
Canon has no choice but to charge sales taxes on their products. Don't blame them. It's the law. Amazon and other sellers can avoid charging sales taxes because they have no physical presence in your state. But, just so you are aware, you probably owe the taxes anyway and while most states don't do a good job of auditing these purchases, that is changing.
I said that; since it made sense to me. I asked Canon about it and they agreed.
On the Tax issue:
I do not think Canon has a tax nexus in Indiana, they have one in IL and WI. I will buy from where ever it seems cheaper to me, if you think I owe taxes, then show me the relevant tax code regarding internet purchases. Does the federal Tax authority think it is ok how Amazon operates, yet holds the individual liable? Shouldnt both be liable or none be?