Tonnes of advantages here; even and consistent blow across registers, good response and seems to keep note slots as they are without a mute, good noise reduction, v lightweight and they seem incredibly tough and durable. Same good solid quality as their standard practice mute. The intonation is pretty good; ok, so it does sit sharp at the bottom, but please show me a practice mute which doesn’t - especially for Picc!
I have two… I lost one and replaced it. Then it turned up again, but the fact I replaced with the same is significantly positive!