Well, I've had my round, braceless tuning slide for about a month and thought I'd share my thoughts. First, thanks to Jack Kanstul for helping me out and getting me the slide. The resaon I got it was to free up the upper register and I could tell right away the difference from the normal 'D' slide that comes with a Zeus. For me the difference in blow becomes noticeable around the top of the staff. The sound is very nice - brighter at the top and mellower at the bottom. The response seems a bit quicker. The intonation is the same. The slotting is noticeably loser, which is fine, because it was pretty tight with the 'D' slide. Overall, I'm very pleased and am using the new slide 100% of the time. Greg PS - I think its .470, but you'd have to ask Jack.