Is the SSD in the new iMac any good? I hear people are saying that Apple haven't included a very good one. Something about Sata II not Sata III. Also, I am told the following: (1) SSD's arent very good with encrypting files / folders and aren't very secure. Is this true? (2) SSD's have a short life span. Does the one included with the new iMac last very long (roughly of course). Are we talking 1, 2, 5 or 50 years (daily usage)? (3) Any other disadvantages with an SSD? (4) Are Apple likely to make a decent one available soon? Thanks.