We had an issue printing - we emailed the developer and he responded within 12 hours. It turned out to be an issue with the browser I was using. We emailed back and forth for less than 30 minutes and he figured it out. He was very responsive and is going to look into the issue with browser. I only wish they would sell code for one-time fee instead of monthly fee, although it is very reasonable. I would recommend to others.
I like it but I wish it would have an option to mark the printed label's orders as fulfilled. Otherwise I have to go and manually fulfill orders for which I printed a label.