Hi Zane,
make sure u get a decent wheel alignment to compliment your sway bar!!!! else it is a waste!
mmm, ride may be slightly harsher, but you may not notice it,
positives are improved handling
negatives will be, that as your car handles better and you start pushing corners harder, the increased stresses will wear out some components quicker, ie. wheel bearings, tyre wear may change, depending on the size of sway bar you get you may need to get beefier sway bar bushes...check with whiteline about this