Google Adwords, Google Checkout, And Junk Clicks?

[dalesellers]

I do a lot of AdWords advertising and am considering getting Google Checkout, which will create the dominant Google Checkout button under my AdWords ads. Almost none of my competitors use Google checkout so I expect my AdWords ads to get higher click through rates because of the attention that the button will bring to my ads.
At the same time, I often bid several positions down so that I don’t get junk clicks from impulsive people who tend to click on the first position (these clickers often have much lower conversion rates). I’ve found that by bidding several positions down often gets site visitors that are more serious and more likely to convert to sales.

With a Google Check out button, this may change. Even if I’m down several positions, I can imagine that I may get more junk hits because of the visual effect of the button. Has anyone noticed this or done any testing to determine the difference between having a Checkout button or not? Thanks for any ideas.

[dartman]

We didn't notice any change in the average number of ADW clicks since adding the Checkout button. If your roi stats change you can opt out (in the setup) of having the button displayed with your ad. Note that you need to get a sale using GC before the button will be added to your ADW ads.

[dvduval]

I didn't notice a change either after a little testing on a couple of sites.