Switching is easy, but not seamless. The user interface requires some getting used to. For instance, Feedly requires three clicks, instead of one, to mark all items as read. Also, after items are marked as read they are not automatically deleted, but remain in view on the screen (in a lighter shade of grey). Feedly also incorporates lots of other stuff that many users of Reader (like me) might not want to use; but at least they're incorporated on a different page.
In sum, Feedly is a plausible successor to Reader, but I'm still hoping for something more Reader like, such as, for example, READER. I wonder if there's any chance that Google will remand its decision to jettison potentially millions of users who do not want to be forced to use Google+.