Not sure if you’re referring to the quality of the audio or the connectivity (staying connected). I have the ReSound Omnia 962s, which are ~equivalent to the Jabra Enhance Pro 10’s at Costco, IIRC. I think the audio quality is very good to excellent. If I want more bass in the Smart 3D app (not sure what the Costco equivalent is), I increase bass in the Sound Enhancer to +6, decrease mid-tones and treble to -2, and adjust the overall volume to my satisfaction.
With connectivity, I have had an issue, also the same issue when trialing the Phonak Lumitys. While out walking around the neighborhood, going by certain houses or areas in the neighborhood, my BT connection would break up, which I attributed to EMI from some houses as the breakup locations were always very reproducible. However, in the past week, ReSound had a Smart 3D app update for both Android and iOS (I’m using an iPhone), which seems to have fixed the breakup problem. In several walks over the past week, I haven’t experienced any connectivity loss at the usual spots. The Smart 3D app has an option on the “More” tab (lower right of screen) for “Optimize MFi Connection,” and that usually helps, although it makes the app less responsive to settings changes. But my connectivity was good after the Smart 3D update, even without turning that on.