Well, i just updated to OS X Mavericks and the first thing that caught my eye was the appearance. Now, it looks very similar but the shading of the windows and the dock are just really clean to me. I do not know if anyone cares about the little details but i do. The speed doesn't really seem to have changed in any way but that just might be me. If you look at the bottom left corner of the screenshot below, you will see that the iBooks and Maps icons have been altered a bit to match the new theme. It seems to me that they bascially took 10.8 and sharpened it up a bit. Mac users. Please comment your opinions on the new interface of this operating system. Also, i'm not sure since i already had this, but for the free upgrade you might need to already own mountain lion (a mac os add-on from awhile back that costs like, $20 now. I think).