I find that this board does all that the description says. Two item that can be improved: 1. The 100 mil pitch holes for soldering the pin-row header need to have a larger annular ring to help increase solder-ability. 2. Ground and (5V) Power plane connectors need thermal relief internal pads to help with soldering.
Thanks to this board, I can quickly add different peripheral controls from Teensy 3.x