I bought an unused ZT 0350 from a member here (which was a great transaction, BTW), and now that I have it, and have used it for a few days, I can honestly say I'm totally unimpressed.
The liners have horrible chatter marks from the machining on both the spine and belly, and are visible everywhere.
The scales are inconsistently beveled from one side to another.
The screw holding the assembly together along the spine are insistent in height.
The liner lock requires very little force to move.
The scales stand slightly proud of the liners in a few places.
The texture on the liners is very susceptoble to damage.
And, perhaps most damning, the clip is held on to the scales directly with two screws. it is not even inletted, and what I have found is that the texturing eventually compresses, causing a loose clip.
The blade is nicely ground, and the finish is good, and the assist mechanism seems to work - but for the money asked, I'm just not impressed.