My criteria for earbuds: lightweight, comfortable fit, easy pairing with devices, voice prompts, and the ability to use only one earbud without needing to perform extra steps. But I can understand that because of manual welding, the solder joints will inevitably be heavy or light, but it does not affect the overall appearance of the product or the quality of the product. 5 mm stereo output to provide the capability of hooking up another speaker. unfortunately i am still in a search of best ANC and Long Battery life, if the battery life was longer and i did not have a personal pain issue with the left earbud for $200 it is absolutely worth it. Ordered several sizes none of which fitted So, decent customer service too. I especially like the charging case because you get input and output charging abilities from it. The best part: Days two and three following a wash are almost perfect, with only a water rinse and restyle after vigorous exercise. Not a deal breaker for me since it doesnt happen often, but its one area where I prefer my Jaybird Vistas since they have an actual button you depress to trigger the controls. Toe strap very rigid - hurts to walk in them for long.