Sorry, just got back from Oklahoma (will post up some pics soon). Yes we love having pigeons all year, they are fun to watch. Clean up isn't bad (about as fun as cleaning up any other critters poo), I haven't had any predators get in and we see red foxes and coons all the time. What I have to watch out for right now is the dang hawks, I have one wanting to catch a pigeon bad but I have been lucky so far. I have 14 right now, any more than that and my 4x4x8' coop just seems too full. My wife enjoys them as much as I do.
Haven't had it in years but never spit any out.