I have flown on a Friendship two times. In 1993, I flew Norwich-Amsterdam on a Air UK F-27 500. It had 52 seats and felt a bit cramped. The big windows were nice, but in the Air UK version, they had some sort of a yellowish sunshield, which was scratched too, so looking outside was not so nice. The flight was quite comfortable.
My second Friendship flight was in March 2000, when I flew Merpati from Denpasar to Mataram. The seat arrangement felt more spacious than the Air UK one.
The aircraft was not particularly noisy, actually I like the high 'shreek' of the RR Darts above the more conventional sound of most newer props. So I don't think there is very much difference in comfort, compared to a newer prop. The ATR or older Dash-8s are about as noisy from the inside, but the Fokker 50 and Dash 8 400Q are more quiet.
nobody has ever died from hard work, but why take the risk?