I have used AdWords with quite a bit of success. In fact, currently it is the only way I am listed on search engines, my CTR is about 4% and my conversion is about 10%. I don't have a large budget, but I have noticed that you don't have to spend a fortune to make them work. I don't try to get the top AdWord listing, as that can be very costly. I focus more on the wording of my AdWord so that it attracts the right people. So far I am very pleased.