I just put mine on 3 weeks ago, with the longer RS9000 shocks and Rancho geometry correction brackets. Love it! I ran for a weeek and a half without the correction brackets, and steering was a little bit flighty. Not real bad, but the brackets definitely help get the "on-center" feel back - especially on the highway.
I WILL say, that to put the budget boost on, is darn near the same bolts loosened & tightened as you do with a coil lift. Personally, I went with the budget boost simply because I'm not ready for 35's yet, and a taller lift would look funny with stock tires.
So yeah, if you don't need alot of flex, and aren't going any larger than 35's - the budget boost is great. If you need flex, height, or plan on 37's, then go coil lift right from the get-go.