I listened to the Q3s and really loved them- incredibly quiet, detailed, superb imaging, but less bass than I was used to. I listen to a lot of rock, blues, electronic, alternative and some jazz and vocals. I ended up choosing the S5s due to my music preference, and my love of a little more bass plus the need for grill covers for the occasional pet/ child visit. I haven't regretted the decision EXCEPT when I hear some of the music I auditioned the Q3 with, like Vampire Weekend' latest. The silence between musical notes and overall detail of the Q series is really incredible- you won't forget the sound, whether you love it or not- it is different and captivating IMHO. Please note, I like many speakers, and enjoy Wilson, Vandersteen, B&W, YG , and many more for what they bring to the table. None of these come close to sounding like the Q3s. I really would love to hear the M Project. Bet it's unreal. ( I wish you could combine the Q3's quietness and detail with the S5's bass, and I could afford it

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