Yes. I auditioned the 420 about a year ago (I did listen to the smaller one for a moment, but it was uninvolving compared to the 420).
Empricially speaking it’s an expertly balanced speaker, with an inbuilt dsp (sort of - an equaliser), so very flexible. The amplification is top notch for a product of its ilk (I think it’s actually A/B class). The FR is very good (i.e. flat and full on specs) as you'd expect. Overall a very decent product, probably one of the best medium sized studio monitors out there along with Genelec, etc.
No doubt you know this is a studio monitor, intended to be used for mastering.