You can spend a lot more and get objectively better performance in studio monitors, but if you can't make a decent mix with these, the monitors aren't the problem

You want the mix to sound good on your studio monitors, stereo speakers, iPod earbuds, bluetooth speakers, vehicles and pretty much anywhere with some consistency

So the end result is that yes, your mixes will sound great on the JBL, but not translate well to other sources

I keep comparing these near fields favorably to my long-gone Yamaha NS10s; punchy, open, easy to get a good mix without a lot of fuss

I would not have trusted any mix I made on these until I had at least 20-30hrs of listening time on them.2