After my woes with the Crucial M500 (probably a bad run, it happens), I had some concerns about receiving this Sandisk (not bad also the Premium delivery test) but were quickly flown ! Indeed, everything was very quickly because everything was successful the first time. The full clone my drive WD Black 500GB 7200 revs / min to this SSD took less than 30 minutes with the trial version of "EaseUS Todo Backup Home 6.5 Trial". Then plug in position and SSD boot .. it worked! Perfs side is really something else. With the old WD drive from ignition of the PC (press the button) and the appearance on the desktop of my launch bar of Stardock applications, it was 1 minute 25 seconds. With this Sandisk what happened to 38 seconds !!! And that's just as quick to launch programs. In short, I do not regret my purchase.