ive had a few variable scopes overthe years and some ok some not. just mounted a swaro 4x12. the thing that struck me most is that through the zoom range i have to make no head adjustment to maintain a sight picture. ive had nikon monarch and a vx111 that were a pain in this respect, you have to move your head dack or forward on the comb depending on the mag.
are european scopes generally better than us scopes in this respect. what has put me off a wide mag range in the past has been this irritation but if this is not an issue on a z6 for example then i may be tempted although it would be hard to justify the expense tbh