I have yet to come across a ZT that wasn’t well executed, even if a particular model doesn’t appeal to me.
I haven’t been into recent models, largely because bearings and TFFs appeal less to me these days. They also make occasional design choices that baffle me and/or polarize the knife community, like the ugly green CF weave on the 0640 (which is an otherwise stupendous knife).
Serendipitously, I carried my 0900 today. That portly little guy always puts a smile on my face. The 0460 is one of my favorite knives for formal & dress-up occasions. The 0450 is one of several timeless ZT classics, and the knife that got me into collecting nice knives.