This is an excellent drive. The SSD cache only works well for very small workloads. Sequential transfer rates will be a lot higher without it. If you want SSD cache, add a 40 GB drive to Intel's new Rapid Store interface or whatever their SSD cachine technology is called. It is well over 200 MB/s now and at $319, you can buy two of them for the price of an SSD, stripe them, and get over 450 MB/s transfer rates like SSDs but with 2 TB of drive space.
I like SSDs, but many of the older models (and some of the newer ones) lose performance over time (though TRIM address this), and they are WAY too expensive.
Using an SSD and having 220 GB of USABLE drive space is just not a useful thing unless you are space constrained such as in a laptop. For desktops and workstations, striping 2 velocity raptors and getting 450 MB/s with 2 TBs of drive space is a much better solution... even with higher access times.