^ I'm not sold on the blower for a couple reasons.
1. Is heat. The JK underhood area gets pretty darn toasty as it is due to a relatively lean-burning enine. While the chip included with the kit would remedy some of the lean-burn issues, the blower itself creates a lot of heat, as does the increased boosted compression (not to be confused with compression ratio- this is that, plus the pressure of the forced air).
2. Is cost. For not much more (relatively), you get a garuanteed, known entity. The 5.7 Hemi is dead-reliable, stock (assuming you leave it that way), and thus built in a way that Chrysler is comfortable giving it a LIFETIME warranty. The supercharger's warranty only covers the kit itself, and says nothing about how well the engine itself will hold up. While Chrysler obviously won't warranty the Hemi you put in your JK, it is garuanteed to last for years as long as you don't mess with it too much.
3. A report I read from Mopar a few years ago about their efforts to make a turbo 3.3/3.8 setup. I remember distinctly the phrase "came apart under even mild boost." Now, the newer 3.8 is somewhat stouter than the 3.3, BUT it is still the same basic architecture. I know that to an engine builder/engineer, "mild" boost is under 14.7 PSI of boost. I can't remember seeing what the blower kit pushes, but it is likely 5-9 PSI on most setups. I know that supercharger boost is quite different from turbo boost, but the problem lay in the rods, which take up a lot of the pressure of combustion, which is increased massively under ANY kind of boost.
While this is not THAT much, it is enough for me to question longevity. I simply won't be able to reccommend something as (relatively) untested as the supercharger kits until I see 100k mile+ individual vehicles with no major problems becoming the norm.
I am in NO way associated with RIPP, and have nothing but the utmost respect for anyone who brings a new and (by what I've seen and heard) high-quality product to the market. As a professional, I simply tend to stick to known quantities on street vehicles. On race cars, I run prototype and one-off pieces all the time, but for a daily driver, I just can't reccommend aftermarket super- or turbocharger kits, especially relatively new ones.
No hard feelings fellas- there's always beer in my garage for you guys at RIPP