OCZ has positioned their Agility 4 as a mid-range solid-state drive which is built around the company's Indilinx controller. In our testing we see decent performance, that, when averaged over all our tests, can claim a solid place in our rankings. When looking at individual tests we see performance ranging from very good to poor. It seems that the Agility 4 really likes certain workloads, but doesn't do so well with other ones. Nevertheless, the drive will still be a huge performance upgrade from a mechanical hard-drive.
When looking at the reviews on Newegg, you can see that many customers have issues with the drive not working reliably. Our drive, which came with the 1.5 firmware out of the box, showed no such problems. It handled our test suite, which ran for around 20 hours, non-stop, with reboots in-between, without any bluescreens or similar problems. Nevertheless, if you experience problems with your drive, make sure you have the latest firmware installed, and then RMA the drive if you can't get it working correctly.
In terms of pricing, OCZ is asking a very reasonable $190 when considering the 256 GB capacity of the drive. This puts it in the number one spot of our GB per USD chart. However, all things considered, personally, I would buy the OCZ Vertex 3, which comes at the same $190 price, but trades 16 GB of capacity (6.25%) for 14% more performance - certainly worth it.