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You will be very satisfied for a few weeks or even a few months. The power improvement is significant and the value is excellent bang for the buck.
But a centrifugal supercharger delivers power in a very gradual and predictable manner. Especially a very low boost centrifugal like the VT535. If you get 5 psi peak boost at 8300 rpm, you will get around 2 psi boost at 4000 rpm. Most people get used to it and want more. You are probably one of those people given that you have all the bolt on mods for your car now. This is why there are several intercooled options. You can get more out of the nonintercooled version with a smaller blower pulley for slightly more boost and a water/meth injection system like Vishnu sells with a retune, but ESS probably will not support this so you should decide whether you want to go that route.
Once you get the boost up on a centrifugal, particularly on an engine with enough displacement to already make good low end torque, the combination works pretty well. On a smaller displacement engine or on an engine like the S54 or S65 that is low torque and high revving, you will never get really satisfying torque but the car will be fast if you wind it out and with the DCT that is fairly effortless.
ESS has a great reputation and I would certainly consider an ESS system. But VFE was offering an intercooled system at a very good price recently and the dragstrip and VBOX results are nothing short of excellent. Might be worth spending the extra money up front for the intercooled version if you can afford it.
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