why do you guy's like a turbo vs a centrif Supcharger?

That guy on E-Gag ( http://api.viglink.com/api/click?fo..._4048wt_1162&jsonp=vglnk_jsonp_13148828610623) is selling his un-used turbo for $200? That is a big WOW! for me. So... I could go to the manufacture of this part and expect to pay slightly more I guess?

I would like to try this one day.