Lob provides a superb level of reliability - we have never experienced any timeouts when calling their servers. Since our requests are processed in real-time instead of batch, this is an important feature. Lob has an easy-to-install Vendor API to use when sending requests for them to process.

Lob makes it very easy to automatically send mail. We have to send many one off transactional letters, and we used to print the PDFs and manually stuff and send the envelopes. We looked into envelope stuffing machines, but using Lob has been much better. The API integration was easy to set up, and letters go out automatically with no human intervention. They can even send checks which is functionality we require/

Finally, an address verification API that is automatic and cleans up poor data entry.