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Anyone has any comments on the play of this type and brand of tuba?

I have the top action version which I have been playing for 7 years. These Kansuls are based off the similar numbered York horns, right down to the brass formula. They have wide slots so you do end up lipping things in tune, but most notes are quite close to center. They have the more organ like American sound. I think they are a do it all horn. I use it for solos, quintet, community band and orchestra work. I think the top action horn play a bit better than the front action version.