I was afraid the sound was going to be awfull, having read this complaint in some reviews, but I actually found my Stentor St II ( + thomastik strings ) sounds better with it.... :O
The sound is warm, very precise and I found it helped me A LOT with playing in tune and with "subtelty" playing, playing anything that would be a little more subtle than I usually would ( well, Could ).
I decreases the violin sound by an extraordinary amout, even typewriting on my computer is now louder than my violin, which, at my begginer level, is indeed a very good thing.
It also helped a lot with the headaches I got from my very bad playing. Now I can just focus on the notes, the way I produce it and overall, on my technique <3.
I am also very happy to be able to play for hours long - I can play on the sofa right across our bed without waking my wife up. AMAZING. Thank you Artino.
The mute comes in a little rubbery case itself contained by a little plastic case, which is such a delight for the tydiness maniac. Love it.
Ps : so sorry for the many mistake, English is Not my first langage.