I installed it without any problems, didn't notice any changes in the sound, but I don't think that they had to be.
It started to creak after a time, I lubricated it, and it became much easier to change the positions, so I would recommend lubricating it before installing it
That's a convenient 3-way switch, can't say so much about it because I changed it only because my previous 3-way broke.
For its price I think that's a good purchase