I've been offering lightly FF (i.e. soaking grain for a day or two only, then starting afresh with clean everything and a spoonful of natural yogurt mixed in the water to supply good bacteria to start the ferment, using different containers for each batch) for about 6 months now, and my chooks thrive on it, and much prefer it to dry feed - they come running and dance round me when I'm bringing them fresh, morning and afternoon. I wouldn't want to make up and put masses in a feeder and leave it out for days though, as I think that's liable to lead to the sort of scenario chickengeorgeto envisions. They also drink a lot less water on it, so you have reduced risk of dehydration or water-borne diseases etc..