I have that kit, easy to install and seems to be good quality. One thing I've read, but I'm not sure about, is that the 9550 are basically stock shocks but just a little longer. I told myself my shocks needed replacement so I went with this kit so I could also avoid spacers. From what I've seen though, there are better shocks out there for not a whole lot more money.
I think I got about 4" of actual lift, even after settling. That kind of worries me because the whole point of the 2.5" was to not need new drive shafts and whatever arms.