Haven't flown a Dash 8 for a long time, for that matter, it has been a while since I have flown any kind of turboprop. But I actually liked them.

They are noisy - it is actually better to sit behind the engine than in front of it. But not by much. Get some noise canceling headphones - they will make a big difference.

They are about the size of a small RJ, but the cabin itself is actually a bit more spacious. They feel taller to me, and have a more upright cross section. Seats are airline seats, service depends upon the airline.

They are a bit bumpier, particularly because they fly lower. But the fact that they have overhead wings actually improves things a bit. It does give a different feel to take offs and landings, though, since the fuselage sits lower to the ground.

They are great for looking out - larger windows, and because you don't have the wing in your way, you can see down more clearly.