The only negative comments were regarding valves sticking.

Loud valves and not as mechanically smooth as other instruments

Get a good brand of Valve Oil like Blue Juice and when oiling do not take he valve clear out

all the valves work very well, I had already ordered a 6

The sticky/slow piston issue remains, which makes it virtually impossible to play any fast moving passage, or to play legato from any note that uses a 'slow' valve to one that doesn't.

Regarding sticky valves: Be sure you are pressing exactly straight up and down, no angle at all

The valves need a little work

I understand that new horns have a break in period, and that new valves may sometimes be slow, but it seems unacceptable to me that the valves would actually stick and not fully return to open position, even right after a thorough oiling

Loved the four valve and sound that it makes

this instrument is great i have had it for about six months and it is still doing good the valves all work wonderfully and and the tuning slides fit perfectly it has a nice roomy sound even when played loudly or softly

and if they get serious about music as they progress further, then make another investment on a higher quality horn as they have then earned it!