Here's my 2 cents.
I purchased that kit way back in 01, before it was really well known about what a great deal it is. It handled well, much better than stock, but I did install MM LCA's at the same time which also improved the handling.
As my needs progressed, I found that the kit wasn't up to my expectations, so I replaced it. H&R SS, Bilsteins and an MM PHB with CC plates. The difference is really night and day, but a lot of it is due to the addition of the PHB. But, the Bilsteins and the SS's did add to the equation.
So, my advice to you is this: before you spend a single dime, think really hard about what your goal is as far as the suspension is concerned.
How much of an improvement are you looking to gain?
What is your budget for the suspension upgrade?
What are your future plans?
For some, the kit will suffice and is a great bang for the buck so to speak. But for others, it won't be enough in the long run and you'll end up spending money twice like me.
Just some advice...