I have a 64Gb SSD external drive which have been using about 6 months. I use it mainly due to the instantaneous seek time. Matlab 2010a loads in under 2 seconds, and large games load very fast, it's like having 64Gb of non-volatile RAM. Although, I just got a 2TB drive for the same price and they are still quite expensive. It depends on what you need more, speed or storage space.