Saw that ski recently somewhere, I want to say it was on the X here. Someone was talking about how that's not even a real Supercharger.
Even if it was pass on $1900. A 650 with lots of mods which would be comparable would go for much, much less. It's a rip off and probably won't last very long on that kind of setup.
For $1900 you could buy yourself a nicely modded 750sxi/SN Superjet. Both of which you would appreciate much more than that. Don't get me wrong I learned to ride on a 650 and it was a blast, it's not a bad ski just don't waste your money man.