Fazua claim their system is quieter than their competitors (well, it is their publicity!).
I'm impressed that a manufacturer has bothered to address the issue of noise.
I'll leave you experts to work out who the competitors are, but most (all?) appear to be crank-based.
Summary: Quiet enough...
Used Orbea Gain F40 eBike for sale with integral ebikemotion X35 system.
The frame is Large, which Orbea suggests is suitable for riders 5'10" - 6'3". Full dimensions can be found here:
https://www.orbea.com/downloads/product ... 019-EN.pdf
I'm happy to double-check any dimensions.