I find they have a slight U-shape frequency response and sometimes (not always) they sound a little sibilant. So they are a fun sounding ear bud, but can get fatiguing with some recordings.
But overall I decided to keep them and play with them longer due to their decent sound, good comfort and Isolation, very programmable touch pads, decent transparency mode, tiny size, and Qi charging. They’re a lot of bang for the buck.
It’s too bad about the terrible EQ choices in the Samsung app - The “bass boost“ and the “soft“ settings help the treble, but also make them sound doll and bland. So I don’t do any EQ - if the source material is too dark sounding I’m usually surprised, but the “dynamic” EQ can fix dark recordings nicely (one of my Van Morrison recordings for example, and some of my old VBR MP3 new age recordings).
The EQ in the Jabra 75t or XM3 apps is noticeably better for getting proper sound out of them. In comparison, the 75T also has somewhat U-shaped frequency response that can be 100% fixed with EQ unlike the Samsung.
The XM3 are not bad without EQ, but upping the clear bass to +3 or +4 makes them more fun. Only occasionally would I bump the top treble slider so it’s easier to leave the slider set to flat.
I’m still not sure about the fit on the XM three, because I really have to twist and wedge them into my ears with the large foam tips or the largest silicone tips. Just pushing them in doesn’t get me a solid seal like the Samsung, Jabra or Sennheiser which all work for me with medium tips.