Hello guys!
Well lately i had been practicing with a shinobi koma, but still a bit noisy and usually I only have time to train at night lol.
So my GF gave me this today
Hi! I’ve seen a video where professional shamisen players (KI&KI) recomended this item. It lowers the sound dramaticly in compatison to ninja coma. Sorry, cannot share the vid itself because it’s closed patreon content.
Late answer and I think you figured out if there is any trouble.
I use it and have no troubles at all, except that the plastic part tend to slip away while playing.
I fixe that with a rubber band that I put around it.
The other problem, it is frustrating to not play with the full sound. So once in a while, bother your neightbour for 15 minutes and remember how much you enjoy to express yourself. 
