Never had a single issue, spend $20-$30 buy an alignment bar and be forever happy, makes setting them up nice a true a breeze.
The other thing worth doing is bedding them with a small amount of 2 part epoxy (emphasis on small) you don't need much like a match head worth on the action where the bases will sit slap your bases on and start the screws, then use the alignment bar to get the bases aligned, nip the bases down till just finger tight using the alignment bar to keep them true, then torque them to your final torque with a torque driver (if you use one).
I also put a dot of blue loktite on the screw threads.
Hope that makes sense.
I would assume anyone having issues with Talleys is having alignment issues which the alignment bar is used to avoid, properly aligned I've never even needed to lap a set of Talleys. This is my experience from mounting and using man sets of Talleys, I rate them as 1of the very best easily obtained lightweight rings.
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