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I believe you have to spend quite a bit to really evaluate PPC results. I track visitor time and CTR for my own sites in detail. I spend $2500 with them in the last month. Very bad ROI and a lot of concerns over conversions.
I suspected a lot of click fraud. To their credit, they did refund me a couple of times (in fact often - which also worried me).
All in all it's a great system with great tools but the results were bad for me.
Regards
The ROI was abismal.
Imo: unless you have a niche audience dont bother with goclick. Anything like loans, credit cards, insurance etc etc leave well alone.
my $0.02.