I played a Severinsen in college (UNT) and in the service. Since then, I've had two more of them, getting rid of them, all.
My first one served me well and it was a fine horn. (Two tuning slides, one of the early ones). Although I used it in concert band, it seemed to me to be more commercial and I played in big bands and soul bands with it, as well.
The last two I've had were part of a horn Safari. My use has changed and I lean more towards horns I can darken. While it's possible with a Severinsen, it was easier on some others. The Severinsen was just a little too bright for me. If you want a sound like Doc's, that's fine. I don't.
A word about the valves. It seems almost mandatory to include how they're the best in the business. Hogwash. I've never had a horn with valve problems. That includes various Schilkes, Constellations, Benges, Committees and Yamahas.
Let's say, for the case of argument, that Getzens are 100%. All your other horns are 90%. But you only need them to be at 80%. It's a non-starter.