Well, not to crap on your idea. Cuz, it's fun to lookie look. This is the Cadillac of boosted horsepower. As they state, linear horsepower gain, which means pretty much flat across the torque curve.
I'm an old school roots blower type, love blown alcohol and fire belching fuel cars.
I like postive discplacment superchargers was over turbochargers - that's just personal preference and no, I don't have a boosted street car.
But, $100 per hourspower is cadillac $ for the performance. While I like conventional blowers for the way the perform over a turbo rig, especially on the street. The turbo's have it hands down for performance and a turbo setup for 50 WHP gain would be somewhat docile and not have a lot of turbo lag and such.
For the sake of bang for buck and ultimately longevity a mildly built turbocharged setup would be more cost effective.
Now, if you have $ to throw into it (roots blower) and that's what you want - it's your ride.
If you could find a used setup, and maybe have the blower freshened up. For 1/2 the price or less of a new one, then things would be more attractive in terms of bang for buck.
Have a look at a Paxton setup. Or that style, they offer the best of both worlds. Basically it's a belt driven turbocharger with an overdrive gear box. Also, look into turbo setups for the additional ~50 hp range. I don't think you could beat a Turbocharged setup overall for bang for buck in the performance range you are looking at.
Another consideration, is this going to be a project car? Or, a nice daily driver. Because, for what you're contemplating, if it's a project car that's a good way to go. The learn supercharging on a nice daily driver method, you will want a turn-key setup and not somthing you build up. Turn-key setup is lotsa $. Build and learn with a project car is a better way to go.
Ya know what? Get a beater, build up a project car, learn what you are doing while you turbo up the crap out of it, and make it phukin' scream. Leave the RSX S alone. There you have it.