The main advantage being that of seeing all the products with all it's varieties, specification and price tag too. But all this comes with an added risk of parting with your credit card data too. Before you go ahead with a transaction it is important that the site you are transacting with should be reliable and quality of product ensured. Some e-portals that have come up both in reliablity factor of price and products are chennaisilks.com(with it's wide range of silks - Chennai being the highest trade outlet in silks). Then there is the mobile phone gallery studiocell.in as well as kesar.in for it's wide variety of homeappliances.