I’ve used them on a few trails and walks
But not on a Tough Mudder course yet
But I’m bringing them to Worlds Toughest Mudder to break them in
Nothing bad to say about these. It's the Craft OCR Speed shoe (same as the Spartan OCR Speed) which was built on the RD Pro platform but with more cushion underfoot. Its got great grip on any obstacle, drains amazingly well after a water crossing, and has enough cushion underfoot that your feet won't ache from every rock you step on. Love these shoes!