Interestingly, as Rod responds to complaints there have been a couple of apologies. Given that people signed up for the service 7 years ago with no fee changes and now have so much more functionality it is a little surprising that the complaints are so vehement. However this is a small subset of customers on the blog. I am going to look at the customer forums and see if there is any angst there.
I don't really see this as a big issue but a price change is always emotional.