Tried them with a decent number of names. Worked fine for the first couple weeks. They then changed their system (Yahoo probably came down on them hard) and the revenue proceeded to drop to almost zippo. Same experience I hear from others. Stay away. Using this program may be hazardous to your financial health.
they have a good system and ad inventory is great (provided by yahoo) for some keywords/terms revenue per click is 2-10x then google. so for certain traffic goldkey is much better then any other ppc using the google feed.