With the 598, you do not need an amp to enjoy it. I would say the design appears sleek and adjustable. Pessime, comode ma veramente di bassa qualità la colla. Not a problem either way, just be aware if that matters to you. And price? You get more with this speaker for less money. I dont see any indication that there is any warranty, but Id be willing to try another pair if there is. Make sure you have everything placed in the right spot dont expect it to charge if you didnt place it on correctly though. I?m only writing this review in hopes the company sees it. Soo many compliments! I have never cared for any kind of ear bud thingies because back in the day they all sounded like poo, why bother.