Well, it's advertised as a 4" lift, but it just ended up at about 5-1/2". It's probably settled a little, but is still about 5".
As far as wheel spacers go, it all depends on the backspacing of your wheels. I'm running stock Rubi wheel with 6.25" back spacing. The lift calls for 4.5" of backspacing so I needed spacers. Event with the spacers, I still have about .25" too much back spacing, but I don't have a problem except that my tires contact the control arms at full turn when flexed. I could fix this by adjusting the stops, but I plan on running different wheels with less back spacing in the future.
I hope this helps.