Your e-mails are an important customer-facing element of your store, so being able to produce professional looking HTML e-mails that match the style of your website/store is a huge bonus. This is a great extension, and it works exactly as promised. The support is second-to-none too. These guys get back to you quickly and even offer bespoke fixes if you run into problems. They've also taken suggestions for improvements on board and have even offered to develop and send me a new version for a specific requirement I have! Fantastic service! Well worth the money, do give it a try - and check out their other extensions too.
Thank you for your warm words. As a small company, InteraMind tries to build itself as a company who contribute to the open-source community and make our customers satisfied.