I just upgraded the HDD on my Toshiba A660 to a Samsung 840Pro 250gb SSD. The lappy was getting hung up constantly, especially running photoshop elements and digital photo professional.
I was a bit nervous about doing the upgrade as I am a complete novice with anything IT. The shop who sold me the SSD did not have the eSATA cable I needed but gave me a HDD connector box to try and it worked without a hitch. Took about 2 hours to clone the disk with the supplied Samsung data migration software.
I nearly fell over when I booted it up for the first time. It was ready to use in 30 seconds. It used to take about 3-4 minutes before I could use it before. Very impressed with the speed programs are loaded up. Office opens in seconds. I should have done this a long time ago.