At the end of the day, it does straighten my beard well enough. However, I do find the button location inconvenient, I always seem to be pressing the buttons by accident when using the brush. The smaller brush at the end seems highly impractical, not sure what anyone would use this for. The larger brush area being recessed back from the handle is also a flaw for me. It should protrude out like a normal brush, making it easier to capture and properly run through all the hair.
It does do the job, but it's not my favourite. The green and black brush was a better design in my opinion, unfortunately the power cord broke on mine, but after nearly 3 years of everyday use, I was happy with the product's life span.