Tools For Measuring Success- Adwords Campaign Experiments

I have seen very few of ppc experts try adwords campaign experiment. May be they are fearing with Google's Strict policies & Competition mode.
Here i am giving you brief Introduction to these experiments:-

What is AdWords Campaign Experiments?

AdWords Campaign Experiments lets you run different tests (experiments) for a campaign. These tests help you measure the impact of changes to keywords, bids, ad groups, and placements before you apply them to all auctions. Testslower the risk of testing new advertising strategies, which ultimately helps you make more informed advertising decisions.