Really? They appeared to be lit in a video that I saw. But my main concern is poking holes through the bezel, and to figure out what specific gun to mod.
They only appear to be glowing on the video I shot b/c my video cam uses a CCD (like a digital camcorder). The camera's eye can see the LED's, but the human eye cannot.
Just to clarify, the LED's are infrared, so you'd need a camera that can pick that up. Like smalltownguy alluded to, I used a digital camera to make sure they were working and was like, "oh wow, THERE they are!". Against my black glittered bezel behind clear glass, you can't see them at all unless you shine a light on them.
The only problems I had with mounting the LEDs on the back of the cardboard bezel were that the plug connection on the circuit board is on the side that faces the bezel, so the board doesn't really want to sit completely flat (fixed with a spacer); and depending how the USB cable hangs, it can pull on the board and skew the aim of the LEDs (fixed by bending the lights). Actually, that digital camera will come in pretty handy when aiming the LEDs; hold the camera where you're going to be holding the gun, and it's easy to see whether or not you're getting nice bright light aimed at that spot.
You won't regret getting one. It's a very flexible piece of hardware, and really, if you have the switches, you could mount it in your favorite super soaker if you wanted to.

Add to that that my experiences with Andy's support have always been positive, and I'm again very satisfied with another Ultimarc product.