I installed the highlifter 2.5" lift, and I could absolutely tell the difference in CoG. I rode a few rides with the lift kit, then removed it. it was nice having the extra clearance, but ultimately not a tradeoff that was worth it to me. I ride mostly mountainous terrain and the higher CoG just wasn't working out for me.
a lift kit like the highlifter that makes the shocks more vertical will also cause you to lose some travel and limit shock action.