Ive never heard of dux coaching but i think everyone's heard of Dux College
My friend graduated in 09 who went there, got a crazy high ATAR of something like 99.85 and state ranked in several subjects, now currently working for them teaching year 10s
I reckon it's a good place, fairly priced (unlike matrix, talent etc) and offering similar quality
but in response to your query, no sorry lol i can't rate any of the ones you mentioned