I had the Mytek and I tried my Susvara with it. The Mytek simply could not drive the Susvara. I did not compare it to any other HP amp (other than the RME), I compared it to my monoblocks. IMHO the subtle observations about differences between the Mytek and other HP amps in driving the Susvara are comparisons of how bad crap stinks. After hearing the Susvara with my monoblocks I have to drop my usual, gentle, cultured demeanor and civility and just scoff at the idea that the Mytek can drive the Sus. I also have to draw conclusions about reports regarding how various HP amps drive the Sus, meaning I cannot take seriously the judgement of those who make those statements. Sorry about being so emphatic and dismissive.
Other than the Sus I found the Mytek to be a POS in general, with my frame of reference being what my ears expect to hear in familiar recordings, auditioned over decades on multiple setups. The sound just sucks, distorted. I sold the Mytek, new, for about $500 - it's not worth that even new. I wouldn't use it even if you paid me.