There’s an interesting recent YouTube video about the Numa X Piano 88 which is highly critical of some aspects of the instrument, including some of its samples and the use of a knob to select sounds rather than buttons. The YouTuber, Fausto Ferreira, also finds the keys on that Numa model too noisy.
With my cloth ears, I can hardly notice some of the things he is complaining about.
He also has positive things to say, including the ease of playing glissandos, and some of the internal sounds including the Vintage Grand which he describes as a “gem” and suggests some settings to bring out its best.
He admits that he is picky, but adds that he enjoys playing the keyboard, especially on stage. And (spoiler alert) in the end he decides that, because of its low weight, built-in mixer and other characteristics (including the ease of plugging in an iPad) is “probably the best stage MIDI controller”.
Worth a watch.