In six months once you're Exalted you can (probably) change it, same as the other rep rings.
And there are no better rings in-game for a block set - highest block value, OK effective block rating.
It has the highest defence rating of any ring, which also helps a ton when you're trying to hit the defence cap while in resist gear.
It's pretty damn good for a standard tanking set as well - the exalted version is over over 0.5% each of block/parry/dodge/miss, for just over 1.5% pure avoidance and 0.5% block.
43 stam is nothing to sneeze at either - there's only 3 rings in-game with more, and two of those are only 45 instead of 43.
The proc is slightly annoying, I'd rather have a flat 200 armour than 800 armour with a 15 second duration, 1 min hidden cooldown. Then again, it''l proc early on AE pulls, which is handy.
Next closest for a block value set are the 3rd chest timed event ring from ZA and the trash drop from TK.
Seventh Ring of the Tirisfalen - TK trash -
http://www.wowhead.com/?item=30028
Signet of the Last Defender - 3rd timed chest, ZA -
http://www.wowhead.com/?item=33499
Contact a GM, and if that doesn't work, start practising ZA. If you have KT down, 3rd chest is achievable.
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