As it says in the item, ''any reference to warranty is to be ignored. Warranty for this item is 90 days as with all B Grade items''
So you get the item cheap, but with 3 month warranty rather than 1-2-3 years etc.
So if your confident in the product, it should be fine, or if it breaks outside of the 3 month warranty, you are stuck, as opposed to buying it new and having a long warranty period.
I'm sure you can probably phone up OCUK and ask them about the specifics for the B-grade on the item you want as to what's missing, any scratches etc. etc.