I saw this software the other day on Softpedia and gave it a shot. I used PrimoCache (formerly FancyCache) in the past and thought it was a waste. I just ran a few benchmarks and am pretty astounded by the results. The real question is can I tell a difference just using the PC? So far no, but then again I just installed this yesterday and haven't played with it much. When you create a new cache it asks if you want to increase Read, Write or Custom. I haven't played with Custom but so far using the Write option it has produced the best results.