Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Super value & performance, long battery life

These are as good as Bose on residual hiss and has nearly as good audio (treble is better than Bose, bass a bit muddier) based on comparison, and only a bit more than 1/3 the cost when on sale. 20+ hrs on a single battery. Kills the roar with minimal hiss. Compact but secure rigid carrying case w/ room for MP3 player & its charger. Super product!