I really like them. I used to fly hour long hops and comfort was similar to the A319/320. It is a bit louder but I always listen to music anyway so it wasn't an issue and I was always surprised at how quiet it was. I am a fan and flyBE seem to be extremely happy as Saad was at Farnborough recently singing their praises.
Ex UK the Q400 is used on some fairly long hops and I wouldn't hesitate to fly them.
Speaking of ATPs - I loved them. They were the first aircraft I flew in and I fell in love with flying because of them. Both in the air and on the ground they have such a unique sound.
I really want to try catch one for one last time with NextJet in Sweden.