Upload & Sell: Off
It all depends....
I have bought refurbished 1D Mark III and 300/2.8L IS etc, all in like brand new condition, great deals for sure; but I also bought some refurbished, not even close to LNIB condition, like several 5D I bought years ago, I would rate the 9 out of 10....i doubt they even should be qualified for being refurbished at the first place, I am not talking a single copy..... so it depends on lots of factors etc...
Simply stating refurbished gears were double checked and have less issues compared brand new one is just not true...
And not all Canon refurbished bodies and lens were refurbished by Canon itself, mostly by third party... and believe it or not, even lots of Canon Service Center repair work were done by the contracted third party.