Commercial composting toilet recommendations

Hello

I'm hoping to get some ideas on commercial composting toilet recommendations.  This is for a tiny house (around 120 sq f) with one occupant.  I cannot expect the occupant to compost their "waste" using traditional humanure system with a bucket and saw dust.  Thus I'm looking at commercial toilets.  Can anyone either recommend a specific system or strongly advise against any?  Ease of operation, how frequently one needs to empty the toilet, and its size are the most important factors.  I'm considering units that use electricity as they promise to need less frequent maintenance.  Any recommendations highly appreciated.

Thanks
Lidia

We have been using an Air Head Composting Toilet for 7 years and love it. We have it on a boat, but the concept is the same. I believe they actually have a slightly larger "home" version for people who have more room. It would require emptying less often. Would never have anything else on a boat, or anywhere else. Two people, full time, we empty the solids container every 4 to 6 weeks. No smell, very little maintenance. A great unit with a fantastic warranty. Check them out: http://airheadtoilet.com/