It can't all be good news and as much as I'd like to share the virtues there are some negatives. If the pee tank isn't dumped regularly (at least every few days) it will really stink when dumped. No smell inside, only unpleasant to dump. Bugs, yep you heard right. All of a sudden I started seeing these tiny beetles flying around. They had gotten into the compost and were thriving. No big deal, just a little annoying when one runs across the ipad at night and you know exactly where it came from. I just shrugged and said "faster break down of the nasties".
Feel free to comment with questions, or email me directly. I have no affiliation with Natures head, just think it's a great idea and wish I'd gotten one years ago.
------Update June 2016-----
I have been using the composting toilet now for a couple of years. I give it 5 out of 5 stars. Last week I took the toilet out and did a total clean and inspection. The vent fan was getting clogged with fuzz, but other than that no worries or issues. I cleaned the intake and outlet screens for the fan and all is well.
Two improvements I'd like to see with the toilet. The dumping of the pee tank is a pain. We try to use the outside as much as possible for number 1, but there are always those times we use the inside. Like I said earlier, it can be rather nasty dumping that tank if it sits for long periods. I'm going to rig up some sort of PVC tank with a direct dump onto the ground. The idea is to have a smaller tank for when needed (friends driveway camp) and a valve for dumping it onto the ground when in the boonies. No more pulling a tank out, just open the valve. We do a lot of travel camping which involves one or two nights in a spot in the boonies. With this new set up we would just leave the valve open and it would be like peeing under the truck for two days. No big deal. The other improvement would be for the 'mixer' in the composter to mix the whole batch. The way is works now is that there is a square box and a round mixer. This leaves the corners of the compost unmolested. I've found that you can greatly extend the life of the compost or time between dumpings if you stir that portion into the mix once or twice. Sounds gross, but once again it just isn't bad at all.
One other thing to consider with a composting toilet. You can't cross from Canada to the states with any extra compost. I usually carry a couple cubic feet or so with me and found out the hard way that they will take it at the border.
Update 2017. The worst part of the composting toilet is dealing with the pee jug. I removed the jug and put this piping in its place. The pipe holds almost as much as the jug. It has a valve on the bottom that we close when not in the boonies or in one spot for several days.