I got my V3 on kickstarter. I opted for the Muses 2 offer at the same time. These external amplifiers replaced the onboard nCore amps in an NAD M10 as an experiment to see if there was any possible benefit to upgrading to the NAD C298 which is a way more expensive proposition than the V3 pair. Reports here suggested the V3 measured similarly to the C298 which piqued my interest, this was a toe in the water.
I listened to them for a while as delivered and sometime later installed the MUSES op amps and they are still there today. Are they better than standard? I don't know, but they are probably no worse and it sounds pretty good irrespective of the price. I never did buy the C298, the Fosi V3 mono pair was good enough. Would I do as some do and try this op amp and that op amp? Not at all. I got where I need to be and have no desire to know any more. And this review explains why.