Re: Kangaroo Pads?
I've used them on a bari sax, and they are VERY quiet, as proclaimed. I think it's because it's a nice heavy layer of leather - not just an ultra-thin layer on the felt and board.
Also, they feel like quality coat or glove leather. On some pads, the leather doesn't even look like leather - like it's surface treated too much - almost "plasticy". The kangaroo pads are very natural feeling. I don't think that every horn needs kangaroo pads, but if you want to go the extra mile, I think it's worth it.
I don't think that they make the horn sound any differently, though they might hold up better over the long haul as the leather is so thick.
I just wish they were available in natural colors instead of only black or white (at least where I've seen them...), though I have to say that black looks pretty cool - especially with a bright silver resonator on them.