I have a pretty large collection of distortion, overdrive and boost pedals.  Every amp seems to like different stuff, so I've kept a lot of them around.  I am an admitted "pedal guy," and know some amps input impedance are such that they do not play well with pedals in front.  But I just got a hold of a nice SC30 and am having no trouble finding great sound combos for this amp at all.  I love the Fulltone Fat boost into an Electro-harmonix "Analogizer" and then the front of this amp.  It's a combo that just screams.  I can easily hold notes almost as long as I want.  Also the tone knob on my fat boost really smooths out the high end nicely.