I had only heard bad things--hard seats, loud vibrations.
I rode on a Commutair 1900 recently, and the seats were nice, made of "leather?", it was a comfortable sound level for a turbo-prop.

For John Q Public, (you know, the one who wants to know why he isn't riding on a 777 for a flight from Charlotte to Greensboro), it would be "horrible", but for me it was fine.

Remember, Im a King Air pilot. While the 200 I fly has wool carpet and sidewalls, LEATHER seats real wood trays, etc., I still have a bond to the 1900s design. (Granted, the 1900 flys WAY MORE cycles than my 200 does, so I forgive a few rattles.)