I have used different Mute's over the last 50 years, I found that they can interfere when using Pizzicato, with this Mute if you want it, there it is in the right place and no interference it's that simple!
I got this to replace one of those cheap rubber tourte mutes everyone seems to have. The rubber one left marks and my bridge and squeaked when I put it on or took it off. They also tend to rattle a fair bit.
This mute has none of these issues. It mutes whilst still leaving a pleasant tone, it is easy put on during a piece as it just slides forwards with no notch to place over the bridge, and it doesn't rattle or move around when its off.
The box it comes in is lovely, but I never use it as the mute is permanently on my violin.
On top of all of this, I think it just looks nicer than the rubber mutes!