I actually bought and returned 2 Predator shafts in the long process of converting over from standard shafts. When I first hit with a Predator shaft, I thought it felt dull and lifeless. I didn't like it at all. Well, as time went by, I tried one out. I bought it (can't remember from where). I tried it for a while and decided it wasn't for me. I returned it with no problems (I believe that I had to pay the return shipping, which seems totally reasonable.)
Next, I tried a 30" Predator shaft. I liked this even less. I purchased it from Billiard Warehouse. If I remember right, there is a guy named Greg there. He was very helpful and offered no resistance to me returning this one. Again I may have paid for return shipping, but otherwise got a full refund.
Later on at the Super Billiards Expo on year, I tried another Predator shaft at their booth, and for some reason it just clicked. I bought it and never went back. Since then I have purchased many Predator shafts. I used to deal directly with Predator. They had a guy there who was so awesome, helpful, and always knew exactly what I was talking about when asking him to pick me out a shaft (Neil Fujiwara-an awesome player for those that don't know). Somewhere along the lines Predator stopped selling directly, and now you must go through a distributor. I bought a 314-2 shaft from Franks Center at the SBE. I bought a Z2 shaft partial for my friend from Seyberts, and then bought a 314-2 partial from Seyberts to send to Andy Gilbert for my new cue. Also out in Vegas, I bought another Z2 for my friend from Omega Billiards.
As for service and returns, it hasn't really come up with any of these companies. My experiences were as follows:
Franks Center: Frank helped me out. He was very nice and pleasant to deal with. I got the impression that he would be happy to stand behind what he sells. The shaft I bought from him has been perfect, so I haven't put it to the test.
Omega Billiards: I forget the mans name who owns Omega. I dealt with him in Vegas, and he was also very friendly and accommodating. Both Omega and Franks allowed me to pull out several shafts and weigh them and pick out the one I liked best. My friend has had no issues with her new Z2 shaft, so we haven't needed any customer service. I will say that they were a little challenging to reach on the phone, but otherwise great.
Seyberts: My two occasions dealing with them were great. They were also very accommodating. They were willing to go through the shafts they had and pick one out that not only was the right weight, but also was consistent looking and even had a high pitch ping (meaning the tone of the sound the shaft makes when you hit with it is high pitch-some people like myself equate this with a dense solid feeling shaft). The Z2 partial was exactly as expected. The 314-2 that was sent to Any Gilbert was the exact weight, looked very nice, and did have a high pitch. The only issue is that is was bigger than 12.75 mm, which is what I wanted, and did not seem to be finished properly (you could feel the transition between the different pieces laminated together). I don't know if this shaft was just unfinished or defective. I haven't taken this up with them, so I don't know how they will handle it. However, I feel confident since they were so nice to deal with so far. If interested, PM me and I'll let you know how it turns out.
Hope this helps,
KMRUNOUT