The only reason I gave them only 4-stars is that the strap is a little short for someone with a high instep and arch. Although I am just 12 and have 12 year old hands, so older people might prefer the Model O. I have to find a spacers myself to fit snugly. No crackle (I see some have reported that and I want to say that phone covers can cause a non full plug in or non full connection and thats the only possible way I can see anyone having issues. 5 months, making product basically unusable in pull-up position. I initiated a warranty request. Als die Schuhe ankamen, war ich erstmal begeistert, weil diese Schuhe auch bei größeren Größen tatsächlich schmal sind, wenn man die schmale Größe kauft. Bike stand is very stable ! For $8-10, these are very good inexpensive sandals for people with flat feet- plantar fasciitis, to wear around the house (inside and out), and out for short distances on rainy days. My son Studio 3 band broke and we were afraid that we would have to throw away the headphones.