Okay, let me start by saying these boots are like that one ex you can't quit. They're AMAZING... until they're not.
First off, comfort level? 10/10. Wore them straight out the box for a 12-hour airport travel day and my feet didn't hate me. That never happens! The wide toe box is chef's kiss perfect.
Waterproof claims are LEGIT. Walked through Brazilian monsoons and New Hampshire slush - dry feet every time. Though fair warning: they do get toasty. Like 'my feet are in a sauna' toasty in warm weather.
Traction is insane on wet rocks and mud. Felt like Spider-Man scaling walls... if Spider-Man wore chunky hiking boots.
BUT (big but here) quality control seems hit or miss. Some pairs arrive looking pre-destroyed? Mine were flawless but read enough reviews to know it's Russian roulette.
Also had a friend whose sole got punctured by a twig (how?!). So maybe not indestructible mountain goat boots as advertised.
Final verdict: When they're good, they're SO GOOD I want to marry them. When they're bad... well let's just say Keen's customer service better be ready.