Never buy hifiman new, i learned it the hard way with my first xs. Always buy second hand if you can demo them or they offer a personal warranty. I have a grand total of 6 hifimans at one point and the he400se’s are built like TANKS (i got a pair so beat up for 20 usd and it had 0 issues). It seems most of the hifiman problems appear in the first week or two. If your unit survives that your fine