Got a chance to play on a SB King Euph hybrid this summer... Wow, what a horn.
About 2 lbs lighter than older King Euphs, but feels great to hold. Loud, and very warm tone- the only marching horn I would be willing to play regularly outside of Drum Corps.
Valves were a little weird- A couple of BD kids told me they were still prototype valves on the horns they had for this season- felt too small for the rest of the horn.
Like most Euphs, Vision is limited by width of the bell.
Overall my favorite marching horn I've ever played.
Played a Yamaha bari all summer- great horn, large bore lets you really push some air through it, despite being a bari.
Finish was thin- a lot of exposed brass by august.
Hope yamaha updates their low brass soon... havent changed since 2000