I liked the high level of service, technical support services. We helped to connect electronic invoices to 1C. We have been carefully choosing from all providers for a long time. We settled on the most competent in my opinion - the Edi provider of Modern trading technologies.
One of the advantages is fast connection, expert advice on setting up electronic invoices.
Of the disadvantages, not all my counterparties are connected, for some reason they do not want to use invoices in electronic form