Working in EMS since 2008, I've owned several pairs of boots, and these are undoubtedly the most comfortable pair I've ever used. They are so easy to walk in, they feel like I'm just wearing a broken-in running shoes.
PRO: comfort, breathability, lightweight
CON: not much support, laces come undone easily
Overall, I highly recommend these boots, especially to anyone doing a lot of work indoors, or in warm climates.