Students will learn better from A than B by a tiny bit. That's just about never what teachers do. Instead, they put in lots of media. More often than not, and especially when help from designers is sought, the media become interactive and demand student inputs often. In these cases, an average 0.5 SD improvement is experienced when media are used.
Students love it.
First test results go into tank. This is not unusual. The act of creating notes is an active learning act, and a timing act. Take that away, or diminish the student involvement, and performance will go down. If one takes that to mean that I'm satisfied with current assessments, that would be entirely wrong.