I was really concerned when I had to set up a 30,000 term campaign on the day of the adwords algo change.
I know this won't seem helpful to many people but the campaign touches on loads of areas so it can't be a fluke.
Here are the stats:
All KW's are 5c or 10c
Just 1% of KW's are inactive
Most are 2 word terms
CTR is only 1.5%
Ave CPC is 4c
All terms route to a unique dynamic page based on KW combo
There are over 50 ad creatives based on the main area the ad is in
Conversion is very good
Sorry I can't be more specific, T&C's & client confidentiality are the issues
To summarize, it paid to have the keyword previously established. Perhaps most people knew this, but I didn't. Had I known this, I would have added a bunch of keywords prior to the switch over and most likely been able to maintain them at a lower rate than post-conversion.
M