Ok, so I think there's a bit of placebo affect with this stuff. If you think it works, then it does.
In 06 I bought the Q-link pendant. I felt something initially with it on that was weird. I check the packaging/instructions, and it said there was some affects that would be short-term for most people. It did go away and I wear it to this day. In 07 I bought a Trion-Z bracelet. Not sure I feel anything with it, but I still wear it. My handicap went down 5 points in that time frame.
Don't get me wrong, I also upgraded some equipment, practiced more regularly and focused harder. If anything start with a Trion-Z or the other new big one (Els wears it) is Phiten bracelet, its a less expensive trial than the pendants.