Brad -
Not sure on the Eval, but I'm always open for critique - of my delivery or the content. It was a balance of keeping people moving but still covering content.
20 folks is the largest SketchUp class I've taught... normally we are at 12-15, much easier to get a flow going.
Something else that bogs us down is when folks show up with poor equipment choices. As far as I know an email or mailing was sent out with a 3 button mouse and a request to have the latest software version installed. Part of the learning curve with some folks was just figuring out how to draw with a touch pad!
But, in general I really enjoyed myself. If I could teach TF and / or SketchUp full time ... well ... I'd love it.
Hopefully my vocal speed and volume worked well for everyone...
-Mike