The model featured here is the cheap contractors choice, a new model is coming, better, brushless, with the heavy duty logo

From personal experience, both are just similar in power and speed in actual use disregarding the variable speed. The brushless has higher saw rate at the lowest speed setting compared to the old 18VLi. The big difference however, is the vibration, where the oldie 18VLi shines in stability. I believe this was covered in the video. Overall cutting speed and performance is still dependent on blade type and quality plus the user technique.

It is brushless, the electronics takes up more space inside, vs the older model which only houses a dc motor