Teaching physical chemistry–lecture recording?

At McGill like many universities, in large class rooms there is the possibility of lecture recording. I have done this for a number of years teaching my 150 or so Physical Chemistry life science students.  Of course there are pros and cons of recording, as noted in the blog by Zimmerman

Although the obvious “pro” of recording lectures is to give students the chance to listen numerous times; review the material; and listen to missed lectures, there is a huge “con” and that is they skip class and opt to listen to my lectures at home.  Last year the attendance dropped to half because lecture recordings are available on line, but this year the time has been shifted  to 8:30 a.m. from 1