Retina 15" Refurb

Hi all,

My GF is thinking of picking up a 15" refurb Retina display from USA (Where form London, UK). She will be over there next month on holiday and the price is really good, almost half the price you could get one new in the UK. Just wanted to ask are these more or less brand new machines that look like they haven't been used before. I do tend to get Refurbs from Dell and they always seem to be brand new machines that have never been used.

Looking for any advice and experience really.

15" Retina Refurb