Sooo... mine is S0. Not too disappointing. I own meelec m6 pro, and compared to bws S0, they have soundstage and some imaging vs slim to none on S0, sound is awesome, clear and crisp vs OK on S0 if I tweak treble knob.
But, I cant listen some music on M6 pros, too reveling, to precise, music I like, as RAM, Rammstein, Godsmack, Metallica... Yeah, punk, rock, metal, non lossless files are simply no fun on m6 pros.
Soundwise, S0 are more "broken", but less distracting and fatiguing. Also if Im out in noisy city environment, low end doesn't exist with m6 pros and music is so much less fun. And head-bang tunes are pleasure, if I tweak the treble knob.
Also bur-in period needed, after 5h-10h of playtime sound is lot pleasing, low end is more toned down, mids dash more present, highs... none existant.