Federer from United States, CA Public Profile

Pros...
P1. Very nice serration on the front
P2. Big size of grip is huge plus
P3. Best beaver tail design to make index finger sit perfectly on the trigger

Now, Cons...
C1. Dang, it's heavy! This was my first impression when I picked up the package out of shipping box
C2. It's two pieces design(the body) with poor lock mechanism and no storage in handle
C3. Rubber over-mold job was bad, leaked out when it's molded, covered the conjunction rail, impossible to close back strap
C4. Rubbery back strap is too soft, deforms along the change of gripping, enlarges the gaps on joint line
C5. Fitting of back strap isn't good - beaver tail portion between front and back strap, straight portion of joint line on both sides
C6. Fitting of 'Glass Filled What-so-ever' isn't good around where beaver tail meets the receiver, didn't sit properly with dry fitting, maybe okay by super tightening the bolt
C7. No 'Red' accent on serration area, No ATI logo on the bottom (feel shame of your product?)

Come on ATI, you can do better than this.

One major one and two minor ones.

1. My bolt carrier can't get back far enough because the end of tube has wrong profile.
It has round profile instead of square when you see the cross-section of inside.
So the spring sits a bit forward, takes up some space and blocks the buffer when it's compressed.
I can barely get to bolt catch with quite a bit of force.
My S&W M&P15T shows about a quarter inch room between the bolt and the catch when I pull back the bolt.
I'm not sure it will function well or not since I returned the item.
But I think the recoil wouldn't feel the same.

2. The castle nut is not wide as much as others. It's like a donuts tire(spare tire) compare to regular size tire. And the notches have some deformation like when you cut a dough with putty knife.

3. The buffer got scratched up by the edges of end plate and deformed notches of castle nut because they put them in the same small bag. Yes, who cares, the buffer goes inside of tube. Just for your reference.

Bought a MAR092-S model but returned.
I found the extended latch is not good design.
1. The paddle is small and located far outside. It will put excessive stress on hinge when you yank back. Just like a leverage.
2. The neck portion connected to the paddle is very narrow. If it got broken in use, this could be the point.
3. The travel of the latch is very long due to the long extension plus no-stoppage design. It causes unnecessary lateral force which goes to the long aluminum body of handle. Also you need more space when you charge.

This is just my point of view.
Since OP takes return, try it, you might like it.