It actually improves (real) high-speed handling, like in sweeping turns, by increasing the forward trail to about 4.2".
But, the sidestand comes out too short, making it hard to park the bike (gotta shorten the sidestand). And the centerstand lift is $%#@! difficult, because you end up lifting the bike straight up for like, 4+ inches.
And, if you are a hotrod corner-rider (like me), you'll grind those rear footpeg mounts into little slanted pieces in a hurry!
Other than that, it's fine!