The equipment has half the curse resistance of other 5* gear and a weakness while the Dread Skelly equipment has two proper resistances. Though the Almirian Set is weighted toward Normal (making it a little better in general than Skelly), it is then objectively worse than the Snarbolax set which sacrifices maybe 10% defense for a valuable sword attack power boost.
As a result, and because I don't like salamander suits at all, I have no interest whatsoever preparing for a Tier 3 Shadow Lair run. (Full disclosure: I don't have any 5* gear yet, but I'm getting close. Also beat all of a Stratum 6 solo without dying today, so I am not a wimp.)
EDIT: If the helm and armor had the fire and shock resistances the Crest of Almire does, that alone would make it worth my time!
The set is just for aesthetics.