The YFH8310ZG has an amazing warm and rich tone while still being very responsive. The finish and workmanship are flawless. I was quite surprised by how light the instrument is. The provided mouthpiece produces a nice sound buy I prefer the Denis Wick 4FL it produces a richer and more mellow sound.
I've read many negative comments about the valve cap screw thread but personally I'm not finding any issue with this, it doesn't feel any different from the other horns that I have - although because of the bottom sprung construction I find it helpful to keep the valves pressed down half-way while screwing the cap.
The case is beautiful and robust, the only thing I don't like about it is that when stored horizontally, the valves are tilted downwards.