They keep improving over time but I wouldn't judge them before 400 hours. I used NPS Q45T contact enhancer with them after a couple of weeks which made a noticeable improvement as well.
I have the Prima MK2 and after a couple months break in, they sound fantastic.
Holographic with tight bass and fine detail without being fatiguing. I'm driving them with a Hegel H190 through a Innuos Zen MKII and a Gustard R26 DAC.
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