I have to plead guilty to starting a bit of a surge in the iFi “iPower” a couple of years ago, yes it measured better w.r.t. stability & ripple than the Netgear SMPS it was replacing. SQ improved, but I have to say nothing like as dramatic as you write Henryski, maybe my Netgear SMPS was not so bad.
Unfortunately the iPower failed & it was returned for a refund. I replaced it with a
Friwo MMP15, this a German brand that supplies industrial products rather than consumer, the MMP15 complies to medical grade spec. It measured as good as the iPower for voltage stability & the SQ was as good as.