I am not a professional web developer, but volunteer my time to manage a small private school's website. That said, the amazing functionality I have added to the website using joomlamailer has made a measurable difference in the marketing capabilities of the school. Initially, the extension worked perfectly, but after I added and changed many other things, the sign-up module stopped working. Pete went WAY above and beyond to resolve an AJAX issue that I was having (unrelated to joomlamailer). I would highly recommend this professional company to everyone.