Antenna Booster

So I recently bought a Jabra bluetooth off eBay. Really good deal by the way if you're looking:

JABRA BT2040 WIRELESS BLUETOOTH

Anyway it came with a free Generation X Cell Antenna Booster.

I've heard of these antenna boosters being just a scam and that they don't really work. What does everyone else think of them? I was just curious. I'd never spend the money on one, especially since I have absolutely no problems with my reception. I just figured since it was free that I'd slap it on if it really does work. Just in case one day I find myself in a area with slightly lower reception.

Has anyone used any of these things and actually saw an improvement? Or should I just toss it? Or does it even matter?

cell phone antenna boosters are "connecting" (making contact) with the antenna in the cellular phone and expanding it (such as one can see with magnetic CB antennae on cars.  Those magnetic bases often have a bunch of wire wrapped up inside them that effectively makes the antenna longer than the whip that is actually sticking out the top.  I have never seen any test results that have shown it makes the reception any better but I understand the theory: the closer one gets to having an antenna that is the full length of the wavelength of the signal one is trying to receive, the better the reception is supposed to be.

The problem with the stickers is that they make more "contact" with the battery than they do with the antenna in most cases because the antenna raises and lowers inside the phone on the other side of the plastic "wall" that serves as the back of the phone facing the inside face of the battery.
(2) They try to "amplify" the signal by passing it through its internal coils, essentially trying to build up electromagnetic field strength.  This is kind of like if you take a bunch of extension cords (such as the 100-foot orange outdoor cords) hooked together and plug it into a wall socket, you will notice nothing as long as they are lying pretty much in a straight line.  However, if you put them in a coil, you will find that there is a massive electromagnetic field coming from them.
The problem with this theory is that the amount of power being received by the sticker is so infinitesimal that if there were any increase it would hardly be measurable, especially when talking about something that has so little mass and such short distance.  Beyond that, once again, the sticker is NOT in contact with the antenna, so it is not going to do anything useful since it would need to have a way to get the improved signal to the internal circuitry of the phone for interpretation and reconstitution into audible sounds.