The Eagle eye does exactly what it says it does. So far off all the frag devices I have used, this is by far the best.
I have only used it with COD Black ops on a PS3 so far, however it works great.
I have been playing with a "Controller" for over 10years, I was reasonably good, but was looking for an edge. So, when I first got the Eagle Eye I thought, "yep its going to take a while to get used too", and was prepared for my kill ratio to drop dramatically. However day 1, hr 1, 1st online game, I was still managing to get a good kill ratio!! Amazing.
With this product though its not just a "Plug and Play" It take some effort from you too tweak it to be right for you, however the forum is awesome, full of tips and advise and even keymapping so you can use other people's and custom the to you. The actual setup is very easy and fast. For instance I can have the device in the PS3 and playing, then decided to change a setting on the EEC, and it takes less than 1 min to pop it out of the PS3, into the PC, and then change the settings, and pop it back into the PS3 and I am playing again all tweaked!
Also, IF you do not have a "Gaming Mouse" it will be VERY jerky, HINT: Standard mouse has around 800DPI, you are going to need 1600 DPI as a MIN. You can pick mice up for £9.99 in store that do this sort of DPI. You can also spend £££ on mice that have 4000+ DPI. If you have one already, you ok.
The final note, its now been around 1 week, and I have been playing for about 4-5hrs total play time, and I am still adjusting it to get it perfect! So BE PREPAIRED to invest the time into it to get it the way you want it.
Over all it is VERY good.
I hope this helps!
ALSO, I noticed a reviewer said you can only configure 2 mouse buttons, this is incorrect, you can only do 3! :) Shoot, Aim, Melee! What else do you need!!!