They are really nice. He makes them out of the smaller Bourns pots and they are really nicely made. As far as the pop there is a very small audible pop when you push it with the strings completely muted but that is the case with any kill switch, it's impossible to be 100% silent when touching the hot to ground. When using it while playing though it is quiet under the sound of the chord or even single notes and I am using these on my EMG loaded guitars that are much more sensitive to popping than any passive pickup. Like I said earlier I have had one on my Charvel for a couple years now and liked it enough to get one for the Strat. Eventually I will have one on my Jackson and maybe even a couple of my passive axes since he can make them with 25K, 250K, 500K, long and short shaft pots. I would definitely recommend them if you like the kill switch effect. After Mrs. Believer wakes up I will try to get a sound bite for you.