Super fast, as should be expected from an SSD. Loads up quick, no noise, keeps cool (31 degrees usually), and hasn't had any sign of failure yet. In use for about half a year.
Its a shame these are being phased-out. For the performance, it's really hard to beat the price.
Having gone down as low as $120 for the 250GB version, these prove themselves to be fast and secure storage. Haven't had one fail on me yet, and I use one as a scratch drive for Premier Pro.