I truly wonder how accurate is google traffic estimator? i'm planning my first ppc campaign and i kind of rely the statistics this tool provides. Thanks in advance
It gives you a rough estimate that will almost definitely be not very accurate in reality. You will have to observe your actual results after you start your campaign.
Exactly, it just gives you ballpark numbers while you are doing your initial keyword/traffic analysis- the real numbers will show while you are actually doing your testing.