I just had a 4 hour session with my new Z3 and came away with a huge smile on my face.
The medium victory tip seems a bit softer than the medium everest tips on my 314-2's and Z-2 which is a good thing. The shaft itself attached to a P3 felt very responsive and gave me alot of feedback. Follow through, draw and english shots were straight forward to execute with no issues feeling the shot or controlling the CB. I had read some feedback on other forums/chatgroups claiming the Z3 felt "hollow", "unlively" and even "dead" so I was expecting the worst but fortunately, I took those comments with a pinch of salt and went ahead with the purchase trusting views of some mates who liked their Z3's.
Having played with a 314-2 more recently, switching to the Z3 was smooth. I started the session running a few racks without having to think - just played as I would have with the 314's. I don't think the difference between the 314's, Z2 and Z3 is as great as some people would lead you to believe. There are some very subtle differences but if you have a solid (and simple) game, you should still have a solid (and simple) game. If you use extreme english every other shot to please the audience, then I cannot comment how it will affect you.
Should you buy the Z3 ?. If you plan to play with it and commit to it, then yes. If you are one of those who are afraid the Z3 will be "unforgiving" and you are not prepared to put in time and effort to adjust to it and to address issues in your game (stance/stroke/aim), then stick to what you are comfortable with.
Do you need a Z3 ?. Of course not. A decent house cue with a nice tip will allow you to develop your game if you work hard at it and have the ability. All these new LD shafts are nice to have but will not improve your game unless you learn and understand the dynamics.