I assume the reason the MBP in question is in the refurb store at all is that it was ordered (with certain specs changed, ie. RAM, HDD speed) and then returned due to whatever reason. In this case Apple then have a different-than-advertised Mac that they need to get rid of to cover costs, step forward the refurb store.
I got my MBP from the refurb store and saved in excess of £450 on what the model +upgrades would have cost brand new. And with not a blemish on it, I can't help but feel very pleased with my purchase!