As pe the gentleman proclaiming the Esoteric is built better not possible, the Esoteric is made out of plates of metal, vs the Lumin which is cut out of billet aluminium.
Rest assured that I have owned 2 Esoteric pieces along with 4 Lumin, including two X1's. I could not find a single flaw in the metalwork or assembly on the Esoterics, the Lumins had plenty. Including flaws in the raw base aluminum that the brushing process was not able to completely remove. Most people wont notice but those who appreciate flawless finish will.