I find it really frustrating that I cannot equip 2 rings of the same type & ilvl. The soldiery tome purchased rings should have the Unique status removed so that you can equip 2. Same goes for their upgraded counterparts.
Right now, I can get to i109 on my bard but no further without getting a coil ring or upgraded coil weapon. I could get to i110 by equipping a useless ring suited for another class but that's hardly worthwhile. At i100, there is the option of getting a REX ring but there is no option (other than coil that requires a static) for i110.