[Open Discussion] Do you buy refurbished tech?

I did post earlier about products from CEX (webuy.com) CEX like many companies grade their goods from A to C, A being like new and unmarked. To be honest I have had C grade goods from them that make some companies A grade stock look poor. B grade stuff is very hard to tell its not new, most items come with a brand new power supply/charger and usually boxed. The BIG decider for me is the warranty. Every item comes with a full two years warranty even C grade items and often where the original manufacturer offers a one year warranty. In all the years I have been buying from CEX, I have only ever had to use the warranty once with a portable hard drive that failed. As that model was no longer stocked they couldnt exchange it and I was given the full value of the original item against anything in stock.