UL listing is exorbitantly expensive. It takes oodles of cash just to pay the lab. And last time I checked, it takes quite a bit of time if you're not one of the bigger companies.
This is why it's not uncommon to find "high end" audio equipment with no UL tags whatsoever. Many of the cottage manufacturers can ill afford to pay the fees to the lab. Even less so when they need to pay those fees to multiple countries for whatever version of the UL those outside the U.S. use.
I wouldn't normally bat an eye if I have non-UL qualified equipment (I don't recall seeing the UL tag on any arcade cab that I own
) but I would be hesitant to install anything that's not UL listed into something that's intended to be a permanent fixture of my home. Or more accurately, anything that's not going to pass inspection as a permanent fixture in my home. Owning and maintaining a home is aggravating enough, I don't need to have ---steaming pile of meadow muffin--- installed that's going to cause headaches for me down the road.
Why 2 buttons? Why not one of those buttons you push it to turn on and push it again to turn it off?
They've been around:
Honeywell's Tap-Lite and
TouchPlate Genesis and a third more-or-less recent kind involving a bare metal plate. There's even one that's just a straight forward sensor plate that can be hidden behind wall paper or even tile.
To start, there's no real indicator of state other than the light itself. If the light burns out or if the power goes out, then you have no idea what state the circuit is currently in. On a low voltage system like Tap-Lite, that might not be too bad but on a high voltage system... replacement and repair can get kind of ugly. Actually, now that I think about it, finding and replacing a relay might be ugly too.
And some, like the metal touch or sensor plate, people get kind of cute and hide them for some seriously lame reasons. Knew one guy that hid his in the metal work on his kitchen wall. It was annoying trying to find the light switch at 2AM all because I wanted a drink of water.
Not to say they're all bad. For some applications, they work well. I've got one for the closet door. Open the door, the light turns on. Close the door, lights turn off. There's a ball bearing N.O. switch in the door. I love it so much that I would love to get them for all the closets but I can't make heads or tales of who made them and no one at any hardware store knows what I'm talking about. The ball bearing looks almost identical to
these ball bearing catches but there's no corresponding catch plate.
Buttons?! I just screw in the bulb to turn it on and unscrew it to turn it off. XD
Ugh... As a kid, I have burnt my fingers many times turning off the lights doing that.