X2 on the no stinging and spider eating attributes of the dirt dauber....yeah they're a bit of a PITA with the chunks of mud in various places, but we don't discourage them around here.
It's been my experience (could be coincidence but many years worth of proof) that if I have a good stock of dirt daubers on the dock, the paper wasps/red wasps don't build there. If I knock the dirt dauber nests down I end up with red wasp nests in the next few days, which are MUCH more aggressive.
I'll take dirt daubers over red wasps any day of the week and twice on Sunday.