We have had them for ages and as I started living in the house I live in now I broke it down. The wooden toilet outside. Strangers who passed by used it too and it isn't very hygienic.
What I have now is an ordinary toilet pot inside (better during cold winters and at night). Underneath is my own hole. I flushed with buckets of water and since Sunday we have a water closet. At least as long as it isn't winter and the pipes aren't frozen.
Btw I saw toilet seats on the beach, above a hole all very clean.