I sent Algirdis a message on Facebook and asked him about this - he said that right now he owns both the Sterling and the XO and will elaborate more in the future why his most recent projects have been filmed on the XO. He also mentioned that the XO had some "cool qualities" to it and works well for what he's been playing recently, which is not "traditional" - popular music I would guess based on his recordings.
Adams E3 0.6 with SS Bell
K&G 3.5D
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Founder and Solo Euphonium
San Francisco Brass Band