I have been on the ETA course and AOPA instructor seminars. Both seem to be run on the basis, were ex-CFS we know best!
I didn't really learn much from the ETA course, and the AOPA course was just a complete waste of time and money. What made it worse was an ex-CFS (but failed CAFFU examiner) seminar instructor, banging on about the EFATO turn back, fine if you in a Lightning (lots of energy and speed, with a big open military airfield behind you, but asking for problems in a light aircraft. Oh and his other pet subject was flying the approach, attitude for glidepath and power for speed was the only way you can teach it.
I cant comment on Ontrack but it can only be better than the others.
P.S. I have no commercial interst in any of these organisations