I know three guys that have the 1/2 inch palmer plates i think that is the size you are looking for. I can tell you that yes they help you make better edges. But two out of the three guys cracked their edges. those two are big guys, 6'2" + and 200 lbs plus. now the third guy is just as tall but about 165. so part of that might be the fact that the 200 lbs, first guy I talked about is 270, put greater force on the newly created week spots.
If you do crack you edges or break your board you might want to look into the nitro magnum, or never summer makes a board for big feet, and I think santa cruz makes a wide board as well. Lastly Burton has been putting out some wider boards, but they don't seem to be as wide as the three brands mentioned previously.
best of luck. but even a three year warranty won't cover everything.