Well to be honest I had a Sandisk Sansa Express.
Those headphones bundled were far better than the crappy EP-630. The EP-630 is all hype because of it bloated bass. The Sandisk bundled earphones are much better sounding with its lovely mid range and decent trebble. Its bass was nice and tight but wont appeal to people who love boom.
I did not use them ONLY because regular earphones are too big for my small ears. The only day I did try them, I was simply amazed at how they sound !