I had the LHY SW-6 and it’s really good for the money. It brings a relaxed and calming effect to things. I do not recommend using the isolated port though, the normal ports seem more transparent.
But I now have the new Matrix Audio SS-1 Pro switch and it’s substantially better than the SW-6. It is $1700 but imo well worth the extra money if you can swing it.
There is one review of the Matrix switch on Soundnews and the reviewer much preferred it over the LHY SW-10 and Melco switches.
I am very keen to try the upcoming ER2 but it been held up for years.