Consideration on Display URL
The results of our eye tracking study and the other two tests show that display URLs are an important component of PPC ads. Modifying display URLs as a test poses a danger of reducing the branding value of a PPC ad by cluttering up the display of the domain name. However, the potential long-term benefit of acting upon a successful test can easily outweigh the short-term cost of a failed one. Thus, for many PPC advertisers, a closely monitored display URL test is likely a worthwhile effort.
(Source: seomoz.org)
