In practice what I've been finding is when I split up a broad matched kw my total impressions for all the variations are actually less than what I was getting before - this was a confirmed issue by my rep - who I feel is actually a good one. Not only that, but my overall cpc is up, presumably since the broad match kws now have worse performance due to removing the exact or phrase match. In theory it should be a zero sum gain I'd think, but I've experienced different. I'd like to hear some other opinions
The good thing so far is that I am receiving some conversions from the newly added keywords.
I also have very low ad positions for the new exact matches and very high CPC for them. I guess this tells me how much I've been missing by doing broadmatch only, correct?
I have found that pricing can vary, CTR can help (on Google) with pricing, and conversion varies greatly.
Many people believe that you can only choose one match type. Not true.