Finished Lift
Lifting the Xterra any will cause alot of stress on the steering system and it's only a matter of time before your center-link goes. Therefore it's a good idea to upgrade your steering the same time as your suspension or at least as soon as possible afterwards.
The lift makes the Xterra a little higher so watch yourself going in parking garages and be aware that it's easier for you to tip over. Other than that I believe the lift is a good addition if your planning of going offroad, it's should be one of the first major modifications you do.