+1 on the b100s. Received them yesterday (at the same time as the zs6) and they're fantastic. At first I thought they were incredibly congested and lacking in treble but soon realised I had them inserted too deeply. When I pulled them out a bit they sound amazing. What tips are people using on their b100s? I used to be super sensitive to treble but really enjoy the prominent treble in the zs6 for some reason and find it more sparkly than harsh. Completely different signature to the b100s but love them too. The bass is fantastic imo. Just to throw another earphone into the mix, the tennmak cello is pretty balanced with lovely mids with good sub bass. Listened to them again for the first time in a while and had forgotten how good they are.