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Looking at both the Eastman 562 and the 534. I play in a variety of low-commitment ensembles and feel like both would be wonderful. Any reason I should consider one over the other? I do play in a mix of concert band things and small tuba/euph quartets. My main concern is how quick the action is on the 562. I haven't had the best luck with quick rotary valves on a tuba. Thanks in advance!

both are great, it just depends on if you like rotors or pistons.

I do trust chinese pistons more than rotors long term