I have it, and it's a good kit. Just realise that with any 3" suspension lift you will eventually wear out the stock centerlink and either replace it at $150 a pop, or get a new steering system. SLR has a new steering system now, or Calmini has one in the works.
On a preference note, the SLR system is more solid with regards to the rear axle.
I have the 10-leaf spring pack and it performs great if you can afford it. The SLR 3-leaf AAL is another option that performs very well if you want to reduce cost a bit.
The down side to the 10-leaf spring pack is it creates a new low-point on your vehicle. Check out the Darlington solution for minimizing this (if you go with the Darlington skids you need this info before ordering correct shock lengths).