Personally, I use it for a few weeks, we can say that has worked well but not in all cases of figures. In dpart, I connected all my effects, namely a dist MetalMuff, a Boss equalizer GE7 and a Boss Micro BR and frankly was whistled normment, until a CRER supplmentaire distortion (in the clear, and well do not silent). So I complt installation by adding a Boss PSA-230P power supply connection to the Micro BR and the miracle, the perfect sound, more hiss and a clear, clear. So my conclusion is mfiance for multi power supply, it is really cheap. And without advertising for Boss, their PSU is really quiet.
NB: This multi power supply transformer is actually a multi output power supply and not indpendantes (spares or for those who prfrent), because if c'tait if the price is multiplied by 4 or 5 (200)