thank you everyone. Sound quality of this headphone is okay. As you all are recommending an external card then these might do some trick in giving a better sound. i compared it with my AKG-K44 and top level sennheiser HD 448 and having a low volume output certainly need to be amped.
they are comfy there's no two opinions on this ... for a rough usage they are excellent if not HD202 is another option.
@Muaaz i need these headphones for my lappy and the sound card you recommend is for desktop sys. thought i've checked Asus Xonar Essence One and they are awesome.
RX700 are not too bad but i just went to the shop and paid for these cans ... should have purchased JVC ones from ebay anyhow they ain't expensive so they will die after a rough use. if i'll be buying a good quality headphones surely will go for Denon D5000.