Our cart was calculating prices incorrectly, these guys figured it out and resolved the problem quickly. Turned out to be an issue with the server and PHP 7, even though this wasn't a Magento problem they fixed it for us very quickly.
Helped us grow our store and advised us on many options to speed up the site as well as the administration. We've been using Magento for a few years and decided we needed some help and support. Max Q Designs advised on several aspects including several admin enhancements, now updating the site takes about half the time it used.