An anon very rarely starts spilling, it is normally a result of a diferent testing method being used, eg. using both AATools and Charon. As far as the reliability goes, quite often proxies are on dynamic IP's, and more often they are hammered to the point where the person is forced to go offline to work out what they have configure incorrectly.
Since my own lists are constantly checking and rechecking it removes alot of my own issues, however I have well and truly put up with the aweful checks in the past. It is really just a case of choosing a method which is quick, and sticking to it.
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