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Atlas is good for a rules-based approach like "keep all my keywords on position #2" or "keep the max CPC on all keywords at $1.50." Also, plan on using Atlas only if your number of keywords is lower.
If you're more interested in bidding according to ROI on various keywords, we've found Efficient Frontier to be a very good investment. We settled upon Efrontier after a lot of reasearch and evaluation other service providers like Did-It etc. So far, no complaints.
I hope this helps!
web pundit, i know this might be a lot to ask, but would you be willing to give us a personal review of Efficient Frontier, id like to hear an in depth analysis if at all possible, again, i know this is a lot to ask :-(
Sure, if you have some specific questions, I can help you out with short answers. In addition, I also recommend that you contact them and ask them for a list of other references too. I found that pretty helpful.