Buying refurbished products is always a bit more tricky than buying new products. It should be okay, all products are tested before sending them back out refurbished. You should make sure that MSI has a refurb warranty so that if something does go wrong you can return it for another one.
Its completely up to you if you want to buy a refurbished product to save some cash. Just make sure there is some warranty coverage. Many refurbs are just returns, others are damaged products that were fixed, so be aware of that.