I had one of those a few years ago in harvest gold that I got from someone at the now defunct "Gibraltar Trade Center", a weekend flea market sort of thing here in Maccomb county.
My father threw it out on me along with a few other things I owned at the time including a vintage "GEM" floor polisher/scrubber that was similar to an modern Oreck Orbiter.
The answer to your question is no, they don't work better than an ordinary HOH dryer, at least I cannot imagine that they do(I have never owned a full size, so no direct comparison) with only a 110 volt heater drawing, at best 15 amps. I don't know the exact figures. The timer has recommended times on it for various loads that are very long, many in excess of an hour. It has been quite a while since I owned this, so my recollections could be a little off, I was probably 10 years old at the time.