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GT is decent if you just want to monitor your positions, and not adjust your bidding with it. But you could log into your AdWords account and get the same info - GT is easier if you are monitor many AdWords accounts at once and don't want to constantly log in and out of AdWords. I don't think any current software package can properly manage AdWords as well as a human.
GT comes close to human abilities in OV and similiar bid type PPCs, but still not as good as someone looking at the competiton stratedy and devising bids. But it can handle rules based bidding pretty well.