My experience: tried Euclid, Centaur, before 92 version. Icarus/Record after 92 version.
As said, the first were heavy and durable. beautiful finish, worse feeling in comparison with shimano top groups.
Compact versions (icarus and Record) improved a lot, both in weight and performance. Record top thumbs are gorgeous.
Never seen in shimano a bearing mechanism so smooth as Campy did....silk....
Rear der: never seen a long life like this: shimano gets plays in the mechanism after a while and you put it in the bin...
This is a road 1991 Record used offroad and it has any minimal plays also if the little wheels have to be changed: impressive.
Some bikes are better than others.