Quite many watching, but not any reply’s, so a little bump before this one goes to the history web...
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Not much help, but I've heard the SET 400, and (many times in different systems) the Graham LS5/9. I can say the SET is not a harsh amp. It is clear, very dynamic, but organic sounding. If you don't mind the prospect of a 30 day trial with the risk of paying return shipping, I think it would be worth a try in your setup.
IME the closest I've heard would be the Pass X series, specifically the Pass X250.5. Different systems but speakers from the same manufacturer, so it isn't a side by side comparison. Tough call as to which amp was "better". SET? Maybe a bit faster, more dynamic, very linear, very good articulation across the range, a nice sound. Pass? Maybe a bit smoother, a bit more articulate in the low end, a slightly sweeter high end, fleshier midrange, again a nice sound. I could live with either one.