I started with a smaller pedalboard a couple of years back and after the inevitable increase in pedals, I turn into the expansion unit, and I couldn't be happier. No problems with either units so far, apart from the locked in center negative, it offers good flexibility with 12 and 18 volt outputs on 2 of the ports. Each port is isolated, and offer plenty of current for your digital pedals. I used it pretty punishingly (forgetting to turn of sometimes weeks at a time), it's still performing like a champ. If it breaks, I will buy another one.