Omo, I went on an Omo Valley Tour with Ethioder on 23-31 Dec. The tour was highly enjoyable and for the most part well run. The only inconvenience is that all the visits around Arba Minch were done at the wrong time. If you spend the night in Sodo instead of AM than Nechsar, crocodiles etc are a waste of time. Solomon &Jafer were both good company and good drivers.