Wee have recently (about 6 months ago) standardized in SSD in all of our new Windows laptops and desktops (or any computer that gets rebuilt due to problems)  So far wee have 700-1000 systems using Samsung 840 pros (I don't deal with the Windows systems anymore).  These computers are never turned off and run a 1200 image slide show after 15 minutes of inactivity (whether they are logged in or not)  Wee have not had one fail.

With that, over a year ago I standardized all of our Mac Pro with dual Samsung 840 pros mirrored and Mac Minis with a single 840 pro (that's 90 computers).  These computers are never turned off and are used 10-12 hours a day doing InDesign, Photoshop or MS Word.  Wee have not had one fail.