Best of luck to Flybe and its staff. They are (for me) a convenient way to get from London to Aberdeen. A bit pricey but that's the price of convenience, no?
The only "issue" I've ever had is when LCY was not allowing anyone to land due to weather. The Flybe reps kept us informed, helped me re-book for free when I decided that my trip wasn't worth doing - 90% of the time I go to Aberdeen I fly back same-day. On a day of chaos they were professional and courteous.
Every time I have flown with them I've had no complaints whatsoever.