3.5/5. The hardware is great. The software availability is a disaster. Tip for future users: Search for "Harman DSP USB Driver" and "JBL DSP4086 Software v1.1.1" specifically. Avoid version 1.0.0.
You want a "plug and play" tuning app like Audiocontrol or JL Audio. The frustration of finding the correct software version is a legitimate barrier. jbl dsp software download