Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good sound...if it stays in your ears.

I actually wanted the MX75 but the store didn't have them. Thought that the MX70 should be ok. That was a big mistake. Like the previous reviewer I couldn't get it to fit in the ear properly. It was constantly shifting when I was using the treadmill or weights. The issue was that the ear buds were just too big and couldn't provide a proper fit. The irony is that the original ipod headphones (the new ones for IPOD Nano) works much better! It just stays fixed even on the treadmill or outdoor runs.