Yes, Link My Books is a legitimate service. It has received positive reviews from users, with an overall rating of 5.0 out of 99 reviews on Capterra. Users have praised its ease of use, customer service, and the accuracy of the data it provides. It's described as a fantastic accounting software company that provides an efficient and reliable service to its customers. However, it's always a good idea to do your own research and make sure a service meets your specific needs before using it.