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The reason the Vortech always comes out ahead of the JRSC is simple- it's running more boost. As for the temperature issue, that's easily remedied with Jackson's intercooler.
The Vortech suffers from what I believe to be obvious design flaws. First, it's located approximately where you stock airbox is. This means charge air must travel further from the turbine to reach its destination. The JRSC, on the other hand, blows directly into the intake ports. Also, the Vortech turbine is driven by a rod stretching across the front of the engine bay. Parasitic drag, maybe? Finally, the Vortech is nothing without its aftercooler. Not only is the charge air heated when compressed, but once again it has to travel further before combustion, meaning it spends more time being heated. Again, the JRSC blows directly into the intake ports- slap the intercooler on, and you've got a great setup.
As for upgradeability, you can always get the stepper pulleys. If you want to run more than 10 psi, you shold either be looking at a turbo or a larger blower.
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