I've flown on about 5 Q400 FlyBe flights this year and only once was delayed due to technical problems (a faulty door at BHD), the other delays were weather related.
I'll echo all the comments made here about the Q400. I really dislike the little plane and try to avoid flying on them. It's always bumpy on landing and takeoff, noisy, claustrophobic etc. By comparison I love the Flybe E-Jets but I don't think they are as comfortable as an A320 but a hell of a more comfortable than a Q400.