Now that I've driven it for a couple of weeks, I can tell you that this baby will surprise tons of people out there, I love it when I'm on the freeway and I see a car accelerating next to me to cut me off and I just give it a little gas and they can't figure out why they don't have room.....
A turbo is much hotter to run, it's torque curve is not very flat, whcih means that the horsepower comes in at a higher RPM, if you engineer it for torque then you don't have enough top end, if you engineer it for HP then you don't get the torque you want, also they are very sensitive to spinning and coking the bearings after you shut off the engine.
The spinning after shutoff is one of the reasons why the car manufacturers stay away from turbos, the bearings get this coking from the bearings running on burned oil, and from there it's only a matter of time before the bearings are gone and then it needs a new turbo. The other reason is emissions, the exhaust cools off when it's running a turbo, this in turn doesn't keep the catalityc converters hot enough to lower emissions.
The superchargers (specially the EATON) use only 1/2 hp when not boosting, this is hardly noticeable. also they meet the durability standards set by the manufacturers and they meet emissions.