I've just started wearing this shoe after not being able to get the Grid Cohesion 4 in my size any more. I feel this shoe is a little firmer in cushioning and a little more restrictive in the forefoot than the 4, and overall not quite as comfortable. The cohesion 4's make me feel like i can fly (evidently, i can't!!). These are not quite the same, but still a decent shoe. Perhaps not quite as responsive as the 4's?