Bought as companion to Hughes&Kettner TubeMeister Deluxe 40 for home recording studio.
Although the amp probably can work without the box in PowerSoak mode 0 watt, I feel it more secure to get it connected to appropriate box, not to damage the amp by some accidental pushing of other output buttons.
Using this box I can practice without earphones at very low sound level and with Red Box speaker
modelling on Tubemeister 40 I have sound of much larger box. Moreover it takes almost no place - box+amp altogether measure 55x45x25 cm. It's relatively lightweight, easy to manipulate. Nothing to complain so far.