Just make sure that you get your "refurbished" gear directly from Canon. When Canon says "refurbished", we know exactly what that means. When another vendor says it, it means whatever they want it to mean. You shouldn't run into a serious problem with major on-line vendors, but I do not know what their warranty offers are.
I bought a 6D when they had the refurbished one on sale. I opened the box, and it smelled like new. Like Ernie said, the gear comes with a Canon warranty, which in most cases is for one year. I have bought a couple of lenses from the Canon refurbished outlet. The lenses come as good as new, too.
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