The speaker notes are incredibly helpful because they go more into depth from what is displayed on the slides. The are very elaborative and help with any confusion a user may have.
Aesthetically, I feel that although the colours are soft and easy to read, I feel that they can become difficult to read from a distance which would cause a viewer to lose their interest, contrary to what Sheldon believes. I feel that the minimalistic effects are disengaging.
The most important points, however, are noted and for a user whom is changing their oil can quickly refer back to the slide quickly and efficiently whilst noting potential safety hazards.
I feel that Google Slides can be used effectively in a classroom when done properly. Personally, I would use them during a math class when teaching Pythagorean's Theorem, while on a SMARTBoard. When doing this, I am still able to write on the board with the coloured pens to work out examples.