Hi, Looking to upgrade my 128GB to Samsung 256GB in my 2011 13" base. Checking in ebay, showed this one: 256GB Samsung Newest 2.5in 470 Series SSD MZ7 OEM | eBay http://www.ebay.com/itm/256GB-Samsu...ultDomain_0&hash=item336b9f5dd4#ht_656wt_1156 Is it simple task to swap the drives? The big question.. Does it work or it has to be ONLY Apple OEM version? Since Apple is all about proprietary stuff!