The mod I did dropped the front about the same 1.5in, but I also put a 120/60-17 front tire so that dropped it another 1/2 or so. I didn't like it that low so I slid the forks down in the clamps, and gained about an inch back.
As far as handling, I don't have the turn radius I used to have (forks are closer to frame) besides that after getting the preload/compression/rebound tweaked, I have a quicker turnin, and it really doesn't feel that much different, other than the brake, that is worth the change by itself!
hope that answers your question.
I did have to use the XB Lightning upper, and trim the Gauge/Headlight mount from it so it would clear my Fairing Mount.
Dale