Yesterday, Google announced the release of AdWords Editor 6.5. I did a detailed post on the new features at Search Engine Land. But, since I posted the second Google released the news, I did not yet get feedback from advertisers on the new release.
All the threads I see are scary. Not only do errors pop up when some advertisers are using it, those who do not get errors say it is about 50% slower than the previous version. In addition, the new editor does not bring in the new quality score metrics.
One issue can be addressed, if you make sure to uninstall the old editor first and then install the new editor. But the slowness and other issues seem to be bugging many advertisers. I am sure subsequent releases will fix the issues.