I have the classic slip-ons with the turn downs. I really like the sound, it is deep rumble and really barks when I open up the wick. The finish is first rate on the set I have. These are on a 2001 Ultra.
I had the basic slash cuts on my Ultra Barge, nice sound but for me just too loud, couldn't hear the radio. I ended up with Khrome Werks HP-100 plus, nice sounding pipes, not as raspy as V&H, but a deep rumble, and I can hear my radio again.