The piston action is smooth, with no issues. All tuning slides move smoothly and can be completely removed. The intonation is not particularly bad, and I was able to play from the lowest to the highest notes. The mouthpiece is the one that came with the instrument and has no markings. I purchased it new 1 year and 4 months ago and have only used it twice for brass band experience sessions. There are no scratches, plating wear, or dents, but there is a spot on the bell where the plating seems to be lifting. This is the only point of concern. It's made in China, so I guess that's just how it is. I've attached close-up photos, so please take a look and consider. Please understand that this is a used item. I will wrap it in bubble wrap and then wrap it with plastic wrap for shipping.