I've been meaning to update this thread for ages. The "Eco-Loo" has been in use for about 18 months:
For the purpose we want it for it's absolutely fine. It gets used about 4 or 5 times a week by MrsR's clients. She's had no negative feedback (although to be fair I don't suppose anyone would be critical to her face) and quite a few positive comments. One client even wanted details of where it came from as she wanted to install one herself.
It's not at all sophisticated, basically it's a large bucket! The urine is diverted to a soakaway, the solids remain in the bucket and are covered in sawdust. When it's full the bucket is replaced with another one and the waste in the first bucket is left to rot for a year or so, then buried in the garden.
I wouldn't recommend it as the sole toilet facility for a family of four, but for occasional use it's just the job
