I ride a coaster brake most days. They're great in the rain and they need almost zero maintenance. If you've ever ridden fixed, the lack of ability to back-pedal when stopped is something you're probably used to. You can always do the fixer's trick, if you stop with the pedals in the wrong place, of locking the front brake, lifting the rear wheel and rotating the pedals to the best place for starting.
Generally I use the coaster brake for planned stops and the front V-brake for unplanned stops.