I'm with 360k on this... I think most people that buy fork braces, are actually looking for the benefit of a steering damper...
Our stock front fender is steel and has extra metal reinforcing in it... I don't notice any difference between my bike without a fork brace, and my buddy Gerry's Savage with one...
Gerry, on the other hand swears he does... as do many others...
For problems like speed wobble, and highway wind buffeting, and brake shudder, a steering stabilizer does the job...
Fork braces just might make a difference with uneven road surfaces and tar snakes at low speeds...
I come from dirt riding, and tend to be insensitive to these...
...
JMHO...
...