Ordered this for an i7 Mac Mini to upgrade the measly 4Gb of RAM included.  Installation was a breeze, with the case a cinch to open and the RAM slots plain as day to pop out and in.  I cannot comment on the speed enhancement, since the Mac was brand new, but it is plenty fast.  Not as fast as a SSD would make loading, but plenty fast for home use (overkill really).  Boot up is plenty fast, more so than Win7.  The price was a significantly less than Apple wants for the upgrade and really a no brainer.  Recommended. 

Question: How is machine?
Answer: Boot up is plenty fast