Even nicer than a "simple" hard drive

Momentus XT hybrid hard drive, in the sense that it has a 4GB SSD and a hard disk tray to 7200 / min.
The "raw" performance through a hard drive tester are good, but unless a westerne digital at the same speed. By cons .... These software are not able at all to assess the impact of this SSD. And it is this memory that makes all the difference.
In practice: 20s start my macbook pro. Before, we had approximately 75s, with a hard drive Western 7200 rev / min !! By cons, it is after 3-4 restarts that this speed is reached.
To launch the software, the first time it's speed "normal", and after a few times, sometimes launch speed divided by 3.
Using the Aperture software on my macbook pro to 4 years there was hard, slow loading speed. Now I can use it reasonably.
Sometimes I had 15 open software, and there was a lag time to navigate between applications, poor engine did what she could. With this drive, everything is fluid!
I expected also a lot of time for the extinction of the machine is done. Time reduced by a factor 2 to 3.
By cons, if a new software I use, the first launch will not benefit from the SSD, but the following times yes.
I am completely satisfied with my purchase. And I have 500GB drives in my laptop. It is a good buy for an upgrade of a laptop