I am having persistent Achilles tendonitis...
I am having persistent Achilles tendonitis in my heel after riding. Are these shoes comfortable in the heel portion?
That only happens when your cleats are set too far forward toward your toes and your saddle height is too high. This is forcing you to keep your calf muscles in tension almost constantly, causing the achilles to get irritated from overuse trying to stabilize your foot. It isn't the shoes!
achillies heal problems can be caused if you like to drop your heal on the down stroke. If this is the case, raise your seat a little bit so that you limit the range of travel of the heal (below the front of your foot)