...but then the Q400 isn't any old prop.
350-360kts true if pushed (up to 1,200kg/h) and if you are not in a hurry 300-310kts true and 900-950kg/h fuel at FL25 cruise.
But noisier and rattly if the NVH and prop balancing isn't kept on top of, but roomy and light in the cabin and good for thin and low yield routes.
Nasty bit of s**t from the pointy end though.....