Re: Conversion Optimizer
Conversion optimizer is basically all about probability the algorithm will calculate the probability of conversion happening depending on your current account stats at your x CPA.
This normally takes in to account your campaign history to calculate this probability.
From my experience if you are looking to control your CPA then conversion optimizer is the way to achieve this with minimum efforts, but if you are looking to increase reach of your campaign and number of conversions also matter to you then CPA may not be the best option for you.
Hope this makes sense