well i've seen a huge difference when trying it at my buddies house on his bigass 32 inch HD TV when we hooked it up to my comp. I can't see it on mine because i don't have WS monitor. There was a huge thread on it in the FH2 forums, their obviously is some kind of noticeable difference because you could easily tell in the screenshots included.
And a lot of people were considering it a "hack" because it literally extends your side view and barely shortens it also. You actually have an 8% field of view increase when it's used properly. I'll try to find the FH2 forum link to it, and you can have a read on it there, i really know nothing about tech stuff like this.
EDIT: found it, here's the link to the site to download it from...details included and Screenshots
http://imk.cx/pc/widescreenfixer/Instructions To use this program:
For Battlefield 2 and Battlefield 2142, edit the shortcut and add: +widescreen 1 +szx 1920 +szy 1200 (or whichever widescreen resolution you use).
For Call of Duty 4, you must set the in-game aspect ratio to standard (4:3) for this to work correctly!
1. Start Widescreen Fixer.
2. Select the game you will be playing.
3. Select the aspect ratio of your monitor.
4. Start the specific game.
5. Use the Numpad * (v1.00 to v1.06), Right Control (v1.10), or ; (Semi-Colon) (v1.10.1 to v1.41.1) key to enable or disable the fix.
The update rate slider is in milliseconds. Set this to a low value for games like Battlefield 2 and Battlefield 2142 (Old Method). For the other games, it is safer to set the slider to 250ms to 500ms as it doesn't need to update so much.
DOWNLOAD:
http://imk.cx/pc/widescreenfixer/WidescreenFixer_v1.41.1.zip