change it... not screw it up
Unless you have someone install it improperly...
The nature of a lift will raise the center of gravity of the vehicle, which means you need to be a little more cautious in high speed turns and parking garages. Some lifts can make the ride more stiff (depending on the spring rate) or softer. A good example of this was on wranglers with leaf springs... Stock ride was stiff, Rancho lift was smoother with more flex. Tires will affect the ride as much or more than the actual lift itself. BFG AT's have very stiff sidewalls which create a stiffer ride. Lower profile tires also create a stiffer ride because there is little flex in the small sidewall.
The only lift I have heard bad things about is the NE lift with the relocs (many threads about this on multiple forums). I think the lift itself is okay, but the reloc seem to mess with the angles for XREAS. If you don't have XREAS, I know of no issues...