I havent run into any game-breaking glitches, just a few silly ones. I had given them 5 start for comfort but if they fall apart in just a few months or less theyre useless. Luckily, they are sandals so the size doesnt have to be perfect. I put some thicker socks on her & they work just fine, & this way they will last her so much longer! Thinking I may have done something wrong, I purchased another one. The whole point of me buying these is to soften up the sound so this is good for me! *Purchased 6 Inch* Il portachiavi è facile da montare (bastano due viti per fissarlo) e discreto. you can tell they are well made and dont tangle like normal headphones! Much better than the ones supplied from original manufacturer.