I bought the Large Advents in 1978 and had them for 20 years or so; long enough to replace the woofers twice. When I finally decided to upgrade it was because we were going from our house to an apartment for a year. First came Epos ELS3s, then Von Schweikert VR1s; both great monitors but lacking something, even after adding a sub.
I stopped upgrading when the Zu Druid Mk IV/08s got unpacked and connected. While they don't sound anything like the Advents, they gave me that same sort of satisfaction. I know the Zus aren't for everyone, but neither were the Advents. Just my experience.
Speakers are so incredibly personal.