The best part about deliverlogics is its ability to integrate with all of our different carriers, including UPS, FedEx, USPS etc. It also integrates well into our accounting software so that invoices can be created from within our system without having to send them out manually. Sometimes it gets slow during peak times when there are many orders going through in quick succession but this has been improved over the last couple years. There have been some improvements made as far as speed goes which I am happy about. We use deliver logics for tracking purposes only. It does not provide any fulfillment services or customer service via phone/email. We do not utilize deliver logics' shipping capabilities either.