A cheap way to run displays through USB (we used them at my work, to the tune of about 200 of them installed at one time...now we are telling folks to get rid of them as we upgrade to Win 10....just using display port these days...which is superior for just connecting 2 monitors to a system...or even 3).
Personally I'd never even consider using them for my home system....but like they say "to each their own".