My first SSD, the OCZ Apex 120GB, lasted for about 18 months. As replacement I bought another OCZ drive, this time from the Vertex series: OCZ Vertex 2 120GB. I read about the new SandForce 1200 Controller in most modern SSDs and that the Vertex drive uses firmware which is equivalent to the SandForce 1500 controller. The Agility series has the “normal” SandForce 1200 controller and lacks some writing speed in some areas.
Detailed review and comparison to other drives, in german: hardwareluxx.de
The bad minimum read spead (~1mb/s) my old ssd had is gone, as you can see in this HDTach screenshot: