A Real Update
I use the Endorphin Pro version 1 for 5K-HM, as i found the stiffness to be a little much beyond 13.1 miles. However Endorphin Pro 3 is an entirely different BEAST. From the upper fit to the responsiveness of the midsole, I can see extending the use case from 5K to Full Marathon. Took them on a 21 Mile long run with 4x5K at goal MP, and they felt amazing while my legs felt great afterwards. This is definitely my fall marathon choice as the responsiveness and comfort is what I’ve been looking for. Highly recommend.