I can't compare this set to the other three volumes as I haven't seen them, but anyone who remembers the series first time around will enjoy this trip down memory lane.
Yes, it's dated, the sets are dodgy, the fight scenes are embarrassingly bad, and there is absolutely no attempt to give the characters either a social or historical context. It's all very fifties acting school and Paul Eddington's 'Will Scarlet' is basically 'Jerry Leadbetter' in tights.
Listened to this through a set of headphones and the sound is fine. You can't expect 21st century sound technology- it is over 50 years old.