I've used a lot of used stuff... its no big deal to me. Its not like I'm paying 4k and they ship me a camera with knobs broken off. New stuff can and does break any time too.
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Some people have a real problem with buying used stuff.
All of my gear has been used by somebody else before.
Refurbished doesn't mean it's going to detonate in your hands, all those kind of products are checked thoroughly prior to their new sale.