The Fender Blender sucks with hums, but sounds great with singles.
Expect a volume drop when using it. I consider it more of a special effect type unit that's great for recording. I don't consider it very useful on a stage....though the octave thing it does is kinda cool.
FWIW.....Corgan made more of his crazy fuzz tones with an EXH Microsynth than he did with a Fender Blender.