Yeah that is a pretty good price for having the lift installed. It usually takes me a around 2-4 hours to lift one as long as all goes well. The shock bolts are notorious for breaking and if they do it can add some time to the install.
The slip yoke really helps eliminate the vibes and is a must have past about 3" lift. The adjustable trac bar is also a nice thing to have to get your wheels back in line.