Hi All We run fairly substantial adwords campaigns. Started off small and have grown and grown to the point I spend more a month on adwords then what my monthly turnover was in the early days. It is easy to waste money and a good adwords manager will save more than they cost you (mine costs $1600 a month) but when you get it right it pays dividends. It is also so easy to track. I have never tried bing or facebook or linked in ads. Be very interested to hear what others have done.