The Garrett Pro Pointer is worth the wait. There are two primary "tricks" that can be done with it and both are useful in the field. When the unit starts up (after hitting the power button), it will automatically set its threshold according to its environment. This means that you can hold it next to a piece of metal when you turn it on and it will automatically use an higher threshold (then the unit must be closer to a metallic object before it will respond). This is often mistakenly called "detuning." To reset it, just turn it off and back on normally (away from metal).
You can also double or triple your range and sensitivity with a large piece of metal (coins work, but only provide a small effect). Activate the unit normally, then hold a large, metallic object (like a trowel) against the side of it on the handle. Slowly slide the object toward the business-end of the pointer until it starts to respond to the metal. Then, back the object down the handle until the pointer stops responding. This causes the EM field of the pointer to be magnified by the presence of the conductive metal. It also causes the circuits inside the pointer to run near 100% threshold, meaning that it only takes a tiny signal to make them respond. This can extend your effective detection range with the pointer from 2 inches to 6 inches. Bear in mind that the magnified field will be less stable and can provide some noise that the unit normally wouldn't. It will work, though. This is often mistakenly called "super-tuning."
I say these techniques are mistakenly called "detuning" and "super-tuning" because they have absolutely nothing to do with tuning. In terms of wave characteristics, the pointer is still doing the same thing. I've also heard/read some others who say that these techniques are not reliable enough to use in the field. Bull. Practice a few times (which you will because Pro Pointers are just that fun to play with) and you can easily learn to accurately reproduce the effects whenever and wherever you want. Honestly, I've only used the field-overcharge (super-tuning) technique a few times, but it has come in handy. Exploiting the auto-threshold (detuning) is much more useful. Ever find yourself sifting through a tiny pile, looking for a piece of metal that you can hear, but not see? You can force your pointer to use an higher threshold, meaning less range, so you can use it to pick apart even a tiny pile.