i've never tried the NYC big muff pi but i used to own the little big muff, which is supposed to be the big muff in the XO enclosure. some people say the LBM has better bass response. i don't know but i dont buy that. anyway, the LBM sounded really good on the bass. retained the lows pretty well; it was basically my ticket into a world of fuzz. but it doesn't sound so good on high 'sustain' (gain) settings, which is understandable since you are compressing the tone, so i wouldn't say it's the most versatile of fuzzes.