After 10 years of playing with 314 shafts I decided to give the Z shaft a real chance, I got two Z-2 shafts (to fit all my cues) and I only play with the Z shafts for now, the plan was to give them a 6 months trial period.
It took me a while to adjust to them on long shots but I do feel more accurate with it then with the 314. I admit that it is not forgiving and any loss of focus and I will start missing simple shots.
Ok see, this is smart (because this guy gave a real testing period, not a week)...all these posts on here about people that played with a regular shaft for 10 years and then decided to try a Predator for a week and hated it...that isn't enough time to learn the difference. When you then go on a public forum and say you hated it, sadly there are many who don't know enough about low deflection shafts, don't realize there is a considerable adjustment period, and will come away with a false sense that the shaft isn't that great.
You know, a lot of people try to quit smoking, but don't like the way that feels after a week without a cigarette. So they conclude "well, not smoking is not for me" and light one up again. After a year, however, they would realize what it means to not smoke, and perhaps only then fully appreciate the difference. I'm not saying it takes a year to convert to a Predator, but it definitely takes more than a week. And I would think all the longer the longer and more you have played with a regular shaft.
Finally, on the issue of the 314-2 vs the Z2...I have to say if you are having problems with the Z2 that you are not having with the 314-2 due to "overdoing" it, your stroke has a long way to go. I have played with a 314-2 for a while now. My friend has an awesome Mike Webb with a Z2 on it. I can pick up her cue and shoot just fine. If anything, I can do some extraordinary things with the cueball with her cue that I can't do so easily with mine. Other than that, not really a huge difference. Don't forget, spin (whether top, bottom, side) ought to come from your stroke. As such, you don't need to go a mile off center, particularly with side spin, to get the results you need. The practice drill I gave her to help with this concept is this: set up a ball straight into the side pocket about 1 foot away. Set up the cue ball about a foot away from that, straight in. Practice drawing the ball back about 6 inches, or following about 6 inches, but you have to FIRE the ball in. When you rifle the shot in, and your tip is anywhere but *exactly* where it needs to be, you are going to get a TON of follow and draw. This will show up as a failure in this drill. Learn to strike the cue ball where you need to. Not *near* where you need to, but exactly where. There are few skills more valuable in pool. Once you learn to do this, the difference between the Z2 and the 314-2 becomes more about the feel of the different tapers, and yes definitely less deflection on the Z2, NOT about which one makes you overdo your shot.
Hope this helps,
KMRUNOUT