Very NICE

I bought these headphones because my friend bought the MDR-71 which was like the same thing with the same performance except the 71 has an extension cord, and i don't want that so i got the 51's. I dont regret it the main reason i bought it was because of the nice deep bass it puts out while isolating outside noise as much as possible with the soft silicons it comes with. It came with a pair of Small, Medium, and Large ones. I am currently using the small ones because the medium makes my ears soar and the large one i didnt even try it on haha. Well the small ones fit in my ears quite nicely but i think its just me but my right ear it doesnt fit as good as my left ears wit the small ones it gives me a weird unbalanced feeling but that is not that big of a deal. I use these headphones with my Creative Zen Micro (known to have good sound quality at 98db signal to noise ratio) and it has nice deep bass just like the ones my friend has. I am very satisfy with these headphones they are light weight so you can jog and stuff with it. HIGHLY RECOMMENDED!