I bought the MD Noble X Universal second hand, lightly used and well cared for, for $125. I felt it was a steal at that price. But a few things about them I've noticed: they don't need much juice to drive but still do fairly well being amp'd. I think they pair best with a brighter source. My LG V30 in high impedance mode sounds really good with them. But then my iFi Nano BL/Liquid Spark in high output mode sounds congested. Low output with the Liquid Spark sounds a bit better but with the V30, the pairing feels less congested overall. @ $249 new these are quite expensive for what's currently out there. I'd say the Ibasso IT01, which I own, share a lot of similarities with Noble X Universal except that they're more v-shaped and yet have greater clarity presence with vocals. Vocals with the Noble X Universal, though mid-centric, vocals feel a little bit recessed in comparison. Timber and imaging of instruments, especially guitar and piano, with the Noble X edges out the IT01 though. The Noble X Universal is great for rock music, chamber music and jazz. With more modern music, hip hop and electronic/ambient music, I reach for the IT01. And fwiw, wide bore tips! Wide bore tips for either of these IEMs. I use Auvio Mediums personally.