There aren't a lot of great options out there for Dynamixel interface boards that are simple, small and functional. I've tried many and this is a great solution, the best I've found! I've made my own small interface board that works well enough, but thought I'd give this a try so I could recommend a professionally-made, high quality board. Mission accomplished! The 'Specs and Docs' links on the product page lead to data for an older product, but it's close enough to provide the essential usage information.
The big downside, for a maker in the USA, is the 40+ days it took to ship from Mexico! I didn't need it right away, but for those who do that would be a deal breaker. I posted a brief and positive review on the Adafruit website and suggested this might be a useful product for them to carry for their customers. I'd suggest contacting them to see if they might be interested in some kind of relationship. Your other products might be of interest as well.