I've got a pair of uninsulated Muck's rubber shoes. The sole pulled away from the toe of one shoe after very little wear.(repaired it with Gorilla glue)
Other than that, I truly believe that they're colder than going barefoot. Rubber get's *cold*.
They're comfortable for a pair of rubber shoes. But I expected better quality for the $70 I paid for them.
Maybe the insulated models are okay for winter wear. But the uninsulated models are warm weather shoes.