Generally, though is not good enough. Ad Center ads take quite a while to get “Approved”. This is not the same as with AdWords where it will take only 15 minutes before having an ad served. Ad Center’s own FAQs acknowledge that it can take up to 5 business days before an ad is approved. For niche products and CPA events, this could be a crucial delay.
Some believe that Ad Center is generally cheaper than AdWords, however the 5 business day (7 actual days) delay is not only annoying, it is extremely disheartening. Also Google’s service runs much more smoothly and works the same for both FireFox and Internet Explorer.