Well Nick my system certainly doesn't sound worse with them in . Its hard to describe what they do but my way of looking at it is that if my system was a camera I've just improved the focus .So I’m guessing the first one did what you hoped? Did it? (I have two in various systems ).
I think that I can also detect a slight softening, but I’m not sure if this is a negative aspect. I’m going to give it some hours over the hols before coming to conclusions.Tried one of these earlier this year did not like in my system, made music sound a bit soft. Since changing system this may be the time to dig it out and try again.