I’ve owned 2 pair of JBL Tune 235NC which is a very similar set of earbuds and I must say The sound on those particular models were awesome. The only problem I ever came across was when placing the earbud into the case to charge for whatever reason the contacts overtime stop contacting properly. Cleaning did nothing, couldn’t really find anything online other than people having the same problem as I did. A lot of times I would pull my earbuds out to listen to just a realize that they stayed on in my case because they didn’t make contact with shut off and they drained themselves dead and once they start doing that is a real pain in the butt. My first pair I called JBL before the warranty was up and they sent me a box and I was able to return them for a new set which started out great but the same developed. Now with the pair I have currently I’m down to one earbud because my left one would never fully charge so I couldn’t find it with the locator app when I lost it.
Other than that issue, which does become extremely annoying after time, the earbuds themselves are great. The sound is awesome equalizer that it comes with it is as well just pray you get a pair without said issue.