Nice small box with a blue led to match the pedal I'm using it with. Doesn't look too finicky, so it probably won't break soon. Don't see it introduce noise either. Great if you need a 18v while running a 9v 1-Spot adapter!
I use this Xotic EP Booste with my Xotic EP Booster and I can hear a big improvement with 18 V instead of only 9 V. No hum or hiss can be heard. The voltage doubler is small enough so that I can fit it on the board and it´s not in the way.