Is your website giving customers the best possible user experience if they look at it from a Smartphone, a netbook or a tablet?
Websites that look great on a PC can give a very different impression when viewed on one of the many mobile devices now being increasingly used to access the Internet.
With more and more devices coming on to the market all the time you are going to struggle if you are having multiple websites designed for PCs, laptops, iPhones and other gadgets.