I can vouch for soulnote, since i own A2 SE. For my taste:
-i listen lot of badly recorded music (like 80's italian progressive rock), so i want a gear that can sound great on good recordings, and also good on bad recordings. Showing their faults, but doing it smooth way so you can concentrate on music.
Soul note tonality is on A2 a slight side of warmth, it is smooth sounding and open & dynamic. I wanted it to have even more organic presentation, so i pared it with luxman cl38uc tube pre, and have been very happy with this combination.
Best part in soul Note is, that it has tube like flow and organic tone. (even more with tube pre)
I have wavac 300b, and i think they both have very similar "taste" and flow, so the short signal path & no negative feedback work here.
To give comparisons: personally i do not like moderrn accuphase gear, i would say they are bit of opposite from tonality of soundnote. (I have heard up to e5000, though not on same system) and i always get feeling when. have in my mind the feeling of organic flow from wavac & soulnote, that accuphase gear is very mechanical, tight, gray sounding. YMMV, but just reporting my listening experiences.