Sorry, I thought you were looking at just GMB pages. I pretty much do manual audits and cleanup using a company outside the states and verify all the top teir local citations myself. I work in a very speciafic niche, so I've worked out a list of sources we claim and manage. I do use brightlocal as a backup to find additional NAP issues and to update sites that require you to use a service.
I have used Whitespark in the past and was very pleased with the service, It's more cost effective to do the work myself. I'm one of the people that believe that doing the work manually doesnt lock you into a yearly fee. Its more work up front, but you have control when its done. One thing to keep in mind when using a service like MOZ and YEXT is that your still going to have to monitor things. Syncing data is never perfect.