It is permabarrier if you are using something like Varshan’s power or Zir’s 2ndary (upgraded to about 11 I believe is the magic spot). So on Sorc not as useful as there are better ways to get barrier. But on other classes if you don’t need the pants for an aspect…it is useful especially at 100% barrier.
But the problem is it falters when you go through your portal where it can’t build barrier over single digits, until you re-equip it (and once it did that outside of portal for me). So it becomes unreliable.