I like that you can set up multiple campaigns for different products/services without having duplicate code or confusing things for your client users. The ability to segment ads into different segments is also helpful when it comes time for reporting purposes! It's not as easy as we would prefer but this could be due more than anything else to our own inexperience using AdWords tools. We're looking at solving an issue of wasted cost where clients are paying too much for unqualified traffic (that they don't convert).
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