Startech makes quality products, so I wasn't suprised to see a well made, heavy duty circuit board. It worked flawlessly in my stoneage Panasonic Toughbook. And, it did help speed things up. This netbook had previosly been used only to configure routers/switches via minicom... but now it needed to perform more demanding duties.
Some random stuff...
1. Make sure you are io bound: does your computer spend a significant amount of time in iowait?
2. The IDE bus is slow... and small capacity: This device, or a SSD will do nothing to overcome that.
3. Would reduced latency improve your computer: This is true for folk's that run a window manager.
4. Are you doing large amounts of disk io: If so a good solution would be to do raid0 over 2 sandisk extreme cf cards. But then you might be reaching the upper bounds of the IDE bus.
At any rate, this device did make my old laptop more usable. And, this is a quality device with a lifetime warranty. So for those reasons, I recommend this device.