Product review (5 stars): Quality OEM part, works great, superfast delivery!
This is a Whirlpool OEM part and is so marked.  I prefer OEM parts unless the price is prohibitive. It turns out I didn't need the start button as it was the timer that was broken, but I decided to keep it as a spare.  It works great, as I tested it before storing it.  It is modular and so easy to install.  Look up how-to videos on youtube.com for your model of dryer and follow the replacement instructions. Also this vendor has super-fast delivery.