I have a few pedals from this series, the Noble Screamer being one of them.  I also have the Blues Disorder.  What I found interesting is that I expected the NS to be much stronger in the midrange than the BD.  That isn't the case.  The blues breaker circuit is a flatter EQ than the tube screamer circuit but in Keeley's application it seems they made some changes.  I bought the NS because they used Tim Pierce's Nobels OD pedal to trace the circuit and there has been a good bit written about that pedal.  Neither of these pedals are on my board but I hang on to them because there will be a time when I want those tones.  I have the Muse, now the MK3, on my board as well as one of the AT Mod.