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I've only had my Adizero Rockets for a few days so have only knocked a few miles out in them. But, so far I like them. They seem to fit similar to the Pro but more cushioning on the forefoot. The sole is more like tire tread in the Rocket and ground contact through the stride is similarly evenly distributed as the Pro. Although the Rocket is less flexible and therefore less ground feel, the heal to toe drop seems less by a millimeter or two; I think the Rocket fits in with other 4mm drop shoes.
I hope to be doing longer training runs than a few miles in the near future so the extra cushioning in the front is a welcome trade off. I had no problems in the Leadville Marathon last July in the Pro, but did the Falls run in Padernales State Park last August, got dehydrated, and at mile 15 had to walk the last 3 miles with bruised and cramping feet - a little more protection and cushioning on the rougher terrain wouldn't hurt.
One more thing I found that's really cool about the Adizero Rocket is the swoosh that extends from the tongue across to the big toe. It's functional; in that when you loosen the the laces at the forefoot it allows the foot to span. Even though these shoes are fairly narrow, I find this feature gives them some breathing room. Also, I have a 12 1/2 in the Pro and got a 12 in the Rocket; the Rocket may be an 1/4 of a size smaller if that.
The Saucony Grid Type A4 is another shoe I was considering and may get a pair this fall if training goes well this summer. I like how it contacts the ground evenly; and it may be a little more flexible and softer than the Rocket and slips snuggly between it and the Pro. The only significant difference in fit structure I noticed was the soft cushion on the sides of the heel and I doubt they would bother me like the way Puma's cup the heel and press against my achilles.