I tried very hard to like OS X but unfortunately Windows and OS X on a GUID partition are not the best solution for a rapid restore of either one. So with my 2010 Mac mini I resorted to installing Windows on the internal SSD and installed OS X (Snow Leopard and later Lion) on an external HDD. Roll forward: Need faster data bus so buy the Mac mini 2011 2.5 with Sandy Bridge last week. Upgrade all OS X stuff and make a backup with Time Machine to external HDD. Slide in USB memory key with Windows install - goes smooth, no problems. Make backup using Windows backup/restore and have tested backup & restore a few times (needed to make changes to install so fresh restore - make change - fresh backup). All running well. Find out today that there is an EFI update - gr... this does not work from external HDD and needs to be installed from internal HDD with GUID partitioning. Need to do a restore from Time Machine and do succesfully EFI update. Sofar OK, can live with this. And now trouble starts - Lion has kindly succesfully hidden the recovery partition and no matter what it cannot be gotten rid off. Boot SL from external HDD: no joy, same with booting Lion from external HDD: no joy. The problem with this is that even if you reformat the internal HDD with "MBR" a windows restore or windows install does not see this as a valid partitioning scheme and does not want to work with the HDD. In the end I had to resort to removing the HDD and formatting it on a Windows machine. Half a day lost. (by the way: it is possible to remove and get the HDD back in without moving the logic board but it is a fiddly undertaking) At one stage SJ said "play nice with your friends", well it is clear that this no longer is the mandate. Apple you've lost me, this was the second and it is the last Apple product I ever buy.