Great content man! For me Gustard is more sweet, musical slightly warm. Smsl is more clinical and neautral. Soundstage its hard to tell but I feel gustard is deeper and bigger. I have a hard choice because for my meze empyrean wich is already musical maybe the smsl m400 is the better dac. But I love big soundstage man! How is the m400? Is it have a good soundstage?