As a professional musician, violinist, I use the KAPLAN rosin for decades. Much is Doubt, Kaplan and Hill have yet compare and measure each other. Bright Hill corresponds to something bright from Kaplan, the dark of the dark Hill of Kaplan. Still, I find that Kaplan sounded excessively has the edge, and have long been known for Kaplan decided. The Light is the sound a bit schabiger than the Dark, a bit flash, more present. The speech extremely good - but a little ugly in tone than the Dark. This new development, which has been around for some time, represents a significant improvement. The dust is significantly reduced - good for rosin allergies - but also good for the violin, but not everyone is so meticulously and cleans the Kolophoniumspuren after each play from. But just for professional musicians who throughout the day and evening concert samples, and the violin mostly in the evening thoroughly wipe - this is an invaluable advantage, remains considerably less rosin at the end on the violin. The less rosin remains on the run throughout the day, the less goes to the rosin paint a connection, and can only be removed with detergents. So my consumption and use of detergents has reduced significantly - the fiddle and her coat will thank. Speech and sound does not suffer. The package represents a major improvement over the fabric cover of the past. The rosin is better protected, the substance which was unsightly with time and looked dingy, - even started to stick, belongs to the past ... The only - we should not forget to turn the rosin with the rotating mechanism from time to time - otherwise you get the at amateur musicians often seen rutting ... that's never before happened to me, because you automatically kept rotated otherwise the rosin every time. Here, in the Kunsstoffdose, you can not so easily turn the Einkolophonieren, and should from time to rotate via rotation mechanism the rosin in a different position to get any ruts. Everyone needs to try at his violin rosin which better matches the sound, I generally recommend the dark variant, it does not sound so shabby and does not have that annoying background noise.