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Steiner T Series Rings have several obvious advantages to the long range shooter, first they save the cost and hassles of installing a level as they have one built-in - excellent. They also have an easy way to tighten them in the field with a regular wrench vs a torque allan wrench or hex key.
Otherwise, what's there to say, they are Steiner so they are excellent quality and that's very important, don't ever buy cheap rings as they will move and they will costs you time and a ton of frustration. Believe me, I had some poor rings and it was a huge time sink and ammo cost to spot the issue and upgrade to better rings.
