Ill be honest, I had my doubts they would hold up after the battery issue, so I waited and used these for several months. However, the quality of the audio itself is 10x better than my (low end by comparison z906) surround speakers, that goes for BOTH the GSP500 and the HD660s. (Size 9s as apposed to 9. Están muy buenos siento que vienen una talla más grande mi nena es 17 le quede poquito grande. Ive also had issues with the battery. I switched hospitals and was limping around because of hard floors. Wear them as house shoes in the winter. Always on the lookout for a shoe (slipper) that gives support BUT also looks good. I wish I had gone with the Feedback stand. I received product promptly which is a big feature for me.