My wallet couldn't take the hit with a kit from Jeepin by Al, so I did a little research into the spacer lifts. I found out at the time that Daystar was the only kit that the dealerships sell in the parts department so that sealed the deal for me. I did it because I wanted extra clearance for when I hit the trails.
The hassle for me was having to compress the spring to get the spacer on. Initially, my friend and I tried using his spring compressor at home...and after trying in vain for 4 hours we took it to Pep Boys to do. I have a spacer and spindle lift on my Titan, and the install on that was much easier because the spacer mounted on top.
Like Elt31987 said, it still drives nice without an alignment. I actually went a long time without an alignment, and I never had an issue with it pulling. After I purchased my MT, the tire shop did the alignment for free.
FYI: You don't want to go over 3 inches with any lift. The CV joints cannot handle that much lift. Rocky Road Outfitters states on their site that they destroyed 3 axles while testing a 3.5" lift.