XFPS rateup PS3
I love this device, i got mine when they were on sale for just over $60
I've always been a keyboard & mouse FPS player so i really needed this.
It works pretty well considering it's replicating the analog sticks into mouse movements, you can tweak it alot with the x & y adjustments too.

XFPS Rateup Adapter for PS3
Wow, is all I can say! Been playing a lot of Battlefield: Bad Company, and this little device has improved my scores immensely! The X & Y for the mouse takes a little tweaking, but doesn't take that long to get just right. It allowed me to map the "w" and "shift" key for the sprint settings used on the PC version of BF2, which was a pleasant surprise. I don’t notice any mouse lag, but that would be dependent on the analog settings for each game and not the device. To get the most out of your mouse, set the games analog settings to high, and then fine tune. Not to mention the “turbo” knife slashing that can be achieved with this device! =)

I highly recommend this thing, and haven't had any lock ups, loss of settings, or mapping issues when disconnected or connected.

XFPS Rateup for PS3
Good stuff! Not perfect if you compare to using a keyboard and mouse for the PC, but close! Worked with a USB wireless mouse as well - Microsoft Wireless Notebook Laser 6000 as stated in the XCM website under the XFPS for XBOX 360 (based on the same technology). The manual isn't all too great - just remember that when you want to map, do that in-game.

XFPS Rateup PS3
I brought the Xfps but too bad its not support the Logitech MX620 Mouse.