TK,
Welcome!
Although I've not heard one, I am certain that the UCE engine sounds just like a thumper like the AVL and like the Classics before it.
It is the general characteristic of the engine that makes it so thumperish - this has never changed.
Maybe I'm not as particular...I enjoyed my Yamaha SR500's, my Yamaha SRX-6, my Harley Davidson Sprint 350SX, and now most of all my 2006 Electra X. That unique sound still turns the heads of those Harley big twin riders in an apparent "What's that?" glance! But I'll never be able to tell a Classic from and AVL by sound only.
Matt