Research: Does "Order Now" and "30% off" help an adgroup?

Statistical Analysis tells us the story

[Sports Workout]

Has anyone tried testing to see if the phrases:

"Order Now"
"x% Off"
"Buy Now"
"Purchase Today"
"Half Off"

etc. etc. in the 2nd Description line produce higher ROI or CTR? If no one has tried this (or knows the general rule of thumb on this) I will conduct some research on this.

Would love to see if someone has tried this before or knows the answer.

Zack

[vibgyor79]

30% off is probably useful as your ad is being informative. Order Now is a waste of space.

Run the two ads at the same time and check their CTR.

[Robsp]

A "call to action" brought our CTR's up slightly. The rest needs to be informative, I agree there.

[wackybrit]

I have found that mentioning prices helps improve the ratio of visitors that buy, but makes the CTR dip. Seems logical, though, and helps keep ad spend down, and conversions high. Not for every product or service though!