I routinely use 0.5 lbs of wheat in 5 gal. batches for a range of beers. I wouldn't say that the flavors comes through much at all. Now body and perception, that is something else. I find it adds to the body and contributes a little "sweetness" to the final product. Not really sweet, more like a thickness that a sugar solution has, but without the sweet taste.
And helps improve head retention, but I add it for the reasons above, the head retention is just a bonus for me