Epifanes varnish brush is very good. Using a good brush will make you throw the cheap ones away. They work better, period. In the long run a quality brush will be cheaper than the throw aways. Buy it once not 40 times or 300 times.
The brush in the video is ~7 years old and has been used and cleaned 250-300 times. Many of the students in my finishing class think it's a new brush when they first see it.