I picked up a pair of the new Altra Superiors to try. I have a pair of Altra Lone Peaks and like them quite a bit, but they are clunky and don't give much ground feel. I wear a 9.5 in the Lone Peaks, but had to go to a 10 in the Superiors.
I'm a very casual runner, but a total shoe slut. I love trying new shoes. I buy all my shoes at Running Warehouse, they are the best company I've ever dealt with. I hope my wife never actually counts how many of the free tote bags she has. My normal gait is a jog/walk/stagger. I live on a ranch in the mountains and never run on pavement. I ran 2 miles to get a feel for the Superiors, then did a 9.6 mile run with 1,600' of elevation gain and loss. This was on single track cattle trails, an old road, and sometimes no trail at all.
Likes: They have a good ground feel, and are quite a bit more nimble. The tongue is solid rather than mesh and does a great job or keeping trash out. I wore gaiters, and only got a couple of small stickers in the shoe. Quite pleased with this.
Dislikes: My main problem is the shoe is tons bigger through the mid-foot than the Lone Peak. They weren't bad at first, but midway through the long run they loosened up, and started rolling around my foot. I had to cinch them as tight as possible to get home.
The new sole design doesn't give good traction in loose soil or shallow sand, it's just too flat. On firm ground or rocks, it's fine. I had one good slip on some leaves. Cleats like on the Lone Peak, or Inov8 shoes work best for me. I don't know if they were going for a hybrid road/trail sole or what.
I had the removable rock plate in, but it wasn't very effective.
Other: For some reason, I hit my right ankle with the left shoe THREE times. Hasn't happened before with any other shoes. The sole is kind of sharp, and it drew blood. I don't know what's going on, the toe is wider than regular shoes, but it's not that much wider.
Overall, I was disappointed with the shoe. With the flat, non-aggressive sole, and the gimmicky removable rock plate, it seems like they were going for a shoe that would be all things to all people, instead of being geared more toward trail running. Huge through the mid-foot, not a problem for me with other shoes.
I stuck some much thicker insoles in and ran another couple of miles. They helped a lot. I'll go on another long run with the thicker insoles and thicker socks and see how they work.