Never had the pleasure of the Herald, but over 2,000 hours on the F27 and....
Not bad.....Not bad at all.....But just a half decent A/P and much more relaxing it all could have been..... Until just a couple of years ago, we were VFR-ing around North and West Africa ( our choice - rather trust ourselves than ATC ) and would have loved something to make it less tiring.....Other than that, always felt safe in the various F27's I worked on and only a single brown trouser day was an RTO when our nose cowl vanished over the top of the fuselage at 80kts at CMN....Never did find out why, but not too bad for almost 8 years in a 40 something years old airframe with a 90+% on time despatch rate in darkest of dark Africa but where lack of spares could keep us AOG for days if not weeks.....We traded ours for a couple of older ATR's a couple of years ago - expensive experience to say the least.....
As for the 748.....My step-father spent 10 years at Avro in Woodford screwing them together and always said it was was built to last - if only he knew now, 40 years later !! Mind you, he also said that about Shackletons and Vulcans.....