What are the latest thoughts on whether adwords are worth the cost ?

I have dabbled before but never had a proper strategy as personally if I am searching for anything I never use anything that crops up through adwords, so not sure if worthwhile.

I rank very high for many search terms already (i.e. top 6 listings) so not sure if I would benefit or not, however many businesses swear by adwords, even of their website already ranks well.

Obviously the internet changes quickly so only really looking for responses from people who have experience in the last few months