It was very easy to use, it allowed us to migrate all our contacts in one go from Salesforce into Dynamics 365 without any issues! The support team is also amazing with their help - they are always there for you when needed even during weekends or holidays!! Nothing so far that I can think about as this tool has been great at solving my problem (migrating data).
We were able solve some problems regarding contact mapping which we had faced while migrating sales leads/customers between different platforms like SFDC & D365 etc., but nothing major yet :) Highly recommended if your looking out an end-toend solution where everything gets migrated seamlessly together then definitely try them. Have used several tools before including other providers who charge high amounts per lead / customer moved over compared to what Datatamage charges! This product allows me have more control than others allowing better customization according too needs.