I have the Sony MDR-10RBTs. Pretty much the same except for bluetooth. I'd say these cans are super comfortable, light, and portable. In terms of sound (and sound is subjective), they have a nice punchy bass with slightly recessed vocals, especially female vocals. Bass can be a little bit strong sometimes. Midrange is great. These are good in an outdoor environment where the sound outside will tone down the bass a little bit and the headphone will become a bit more balanced.
Overall, i like them! I'm no audiophile but i think these cans are great value for what they offer, but test them out yourself before you buy them if you're really worried about sound.