This is my personal beef:
My ladyfriend bought a $2,000+ Envirolet last year, and it did not work as advertised, so she switched to the humanure setup, which I had been using myself for over a year. Problem with the commercial composter is that it's way too complex, gets jammed when trying to clean it out, and doesn't really even compost anything, anyway.
Just dries it out. Plus, it smells more than the humanure toilet, and the ventilation system draws out the smell and gags you while you work in the garden. Buyer beware! Not recommending anyone purchase these over-priced, poorly functioning money pits. Can't get your money back, by the way (at least, not on the Envirolet). Humanure toilets are simple, cheap (about $50 DIY), effective, and don't smell if you use them right (which is way easier to do than a commercial 'faux' composter, anyway). The composting happens in the backyard bin, where it's supposed to, feeding worms and anaerobic archaea.
Wheew, ok, this rant over and done. Sorry, but wondering if anyone else on this board actually had success with a commercial compost model...?