I can't speak from firsthand experience, as I never owned the two pieces at the same time...but from what I remember of the characteristics of my Spatial M4 Turbos (which I regrettably had to sell) and what I now know about my Belles Aria integrated, I'd imagine the match would be spectacular. I've swapped integrateds a dozen times in the last 6-7 years, but this one is staying. A reviewer said its sound was like "tubes with more grunt"...it's an apt description. Everything is just...right. Decent onboard phono and headphone amp, too. I couldn't be happier, especially for its relatively reasonable price.
YMMV, as always, but IMO it's an impressive little beast that unfortunately hasn't gotten the coverage it deserves.