I have used Alaska Arms, Warnes and Talley rings on both ZKK 602 and CZ 550.
Here is my feedback,
deewayne2003 and
Sideshow, based on objective facts rather than subjective likes or dislike...
Alaska Arms
The Alaska Arms rings I used had their lever on the left side and the recoil lug was part of the clamp plate.
I personally thought that having the fairly large levers on the left side was not ideal because they dug in the side of my body when carrying the rifle with the shoulder strap.
I also noticed that having the recoil lug on the clamp plate, hence making it a moving part, as opposed to being on the body of the ring, hence making it a fixed part, was less conductive to a perfect return to zero. It typically took a few shots to settle the rear ring in place under recoil, and this had a slight impact on the zero..
I stopped using them for these two reasons.
I understand that they now offer right side lever rings. This alleviates one concern, but I do not know if these have the clamp on the right and the lug on the left side, hence alleviating the issue of the lug on a moving part?
Warnes
The Warnes rings have a pointed top where the two rings join. One may or may not like the aesthetic of that...
More importantly, the recoil lug is located at the middle of the rear ring. This makes the rear ring overhang slightly over the ejection/loading port and I found it inconvenient for loading.
Also, the levers have very sharp edges. This can make them painful to use or when manipulating the rifle e.g. loading the magazine.
I stopped using them for these two reasons.
Talley
To me the Talley rings are the most practical due to the location of the recoil lug at the front of the rear ring. They center on the rear bridge and do not overhang over the ejection/loading port of the action. I find this a plus.
Also, the levers have rounded edges. This prevents scratching your fingers/knuckles when using them and manipulating the rifle e.g. loading the magazine.
I am therefore only using Talley rings now, some with levers - CZ 550 DG rifle where scope removal is a plus for close range work; and some without levers - Win 70 .300 Wby and Mark V .340 Wby where scope removal is not desired.
I am entirely satisfied with them, including a very reliable return to zero with the removable rings.
I hope this helps