The Vaquero has a really good following as a simple, multi-use detector, especially in the US. The Vaq is not a cheap toy, but a very capable detector that can go very deep, a lot deeper than some other detectors in the same range (especially using the supertuning method). It also has one of the best discrimination circuits on the market that can accurately weed out whatever junk you don't want to find.
Applications include coin hunting, relic hunting, beach hunting, and even some goldfields work with a frequency range of 14.3 to 14.7 khz, which is a good multiuse frequency without being too high to miss deep targets, and not too low to miss the small stuff. The are three choices of frequency to chose from to prevent cross talk between detectors in close proximity, plus manual ground balancing to enable detecting in reasonably mineralised areas. All tesoros have life a lifetime warranty( need to read fine print on that one regarding purchasing within Oz, or bringing one in from the US send hand).
Other plusses include its extremely light weight, has a good coil range from tesoro and NEL, easy and accurare pinpoint fuction (the bid red button), and the fact that it only requires one 9 volt battery which will last for a few hunts. It is extremely easy to use, especially for people that don't like digital screens and prefer beep and digs machines.
I found it 100% easier to use than the Minelab x-terra 305, no screen to worry about, no confusing numbers and tones to try and decifier, just set the discriminating to knock out any targets you don't want to find, and away you go. You also have the option of working in all-metal mode with the discrimination turned off, thiswill allow you to hear the deep faint targets, and the preferred method for prospecting - basically dig everything in this setting.
I no longer have mine, though it is still an excellent detector, I now prefer to have specific detectors for specific tasks or environments(think gold detecting/beach detecting), something you learn through the process of owning different detectors. There are a few Vaquero owners across the forums that own the Vaquero, and they all love the machine.