Review on Superior Performance: DaierTek Waterproof Latching Pre Wired Illuminated - Ideal for All Environments by Zach Sornsin

Overall they are good and easy to install but when submerged in water they will let water through the button surface. While they are suitable for wet locations or the occasional wet mopping, they are not for serious applications that require a waterproof switch (which must be sealed from the inside with a continuous membrane).