SSH doubling the speeds

Wanting to replace a slow HDD running at 5400 RPM, I wanted to acquire a very fast hard drive. However, not having the means to offer me a SSD, I pulled on the intermediate solution: the famous SSH Momentus.
I can say I do not regret it. Combining capacity (500GB beast) with a zest of SDS performance (4 GB flash memory), responsiveness of the system has just been doubled! For example, Windows starts in 50 seconds (12 seconds boot included) against 1'40 "before, Firefox starts in 3 seconds (against 8) and Word 2 seconds (against 10).
Upgraded the firmware SD28 when I received the raw transfer speeds are well worthy of a 7200 RPM: 40-50 MB / s write large files and 1 MB / s with the little ones. The computer has become reactive, finished the time freezes due to the slow hard disk access.
The Windows Performance Index is 5.9; because it does not recognize the SSD part. Although it does not appear in the hard drive capacity, one feels good though, and is fully managed by the Firwmare which automatically puts all the files that are most often used.
Finally, I am glad I bought one month before the floods in Thailand have increased prices by 2 HDD: I was able to have it at least 85.
As for Amazon, he shipped my order in two packages on its own initiative in order not to delay the arrival of the fastest object, what I enjoyed.