The ‘Behringer PS 400’ works stably, and its design is robust. I am not completely satisfied, though. In fact, it lacks a switch to power it on/off. So, when it is plugged it is permanently on, and it is very annoying to plug and unplug it all the time. Especially when you need it for several days in a row. If I had known (noticed) this before I would have bought for myself a different model with on/off switch, but if you are short on budget it is anyway a good choice. I have never had a problem with it and I have been using it already for one year.