I like valves that never let me down. My Getzen horns never let me down but the new bought Straub with Baurnfeind and my 80's Bach did... That was The Horror
But actually, at least 60 second hand horns later, I never had valve issues with later horns like Conn 22B, Conn 22B USA, Julius Keilwerth, Selmer Radial, Selmer, Yamaha (even one with plate loss!), B&S, Antoine Courtois, Melody Maker, Martin Handmade, Jupiter, XO Brass, King, Schenkelaars, Olds, Buesscher, Holton and the ones I already forget had fine valves so what can I say?
I like the Yamaha valves and the valves of my later Bach trumpets where great as well; good compression even after 30 years of intensive use.
Since I like Getzen instruments I tend to have a favor for Getzen valves but actually I have to admit that there are many great valves out there
