Way too cool for backend keywords, saves a lot of time and hassle that's for sure.
I just wish i knew about this sooner before i spent that much on amz one and such, plus spend all the budget on ppc. Having access to what a seller had in the background also means you get access to a wealth of PPC knowledge. Think about it. The seller uses auto targeting, then fine tunes it..collects the data then goes onto the manual camps with much more precision. Then.. he updates the backend kw that you now have access to.