High quality item great for replacing a single utility button with a single item with dual utility. In my case I converted my cab to run off retropie, which needs a start as well as coin insert button. So simply replaced the start button (player one and player two) with this item that provides a start+select functionality. I have a twin USB encoder and needed the polarity switcher for the 2nd player side; so great that they even thought to include polarity switchers!
Great product

As for the buttons, they are quality piece of equipment, simplicity, and the board are great. The fact that they are two buttons in one slot is useful. I cannot say anything bad about the buttons themselves. Now for my use I wanted to utilize the buttons on a raspberry pi and split the buttons for individual use on the PI and my existing hardware. it comes with the wireing to do it to an extent by using the In-N-Out pins on the board. It was quite easy to set up a momentary switch on one of the buttons, but to be able to utilize the LED feature I was not easily able to configure so I decided not to Now, all that being said I am utilize these buttons in addition with the IKari GRS set that has pre-spade connectors for additional buttons so I removed the plastic connector on the 2 in 1 buttons to separate the wires for individual use. I was able to connect them up and secure them without any irreparable damage and they work great , I just need to figure out the best way to be able to use LEDs if I choose to