Thoughts on GM Tranny fluid

regarding a post on hondatech http://www.honda-tech.com/zerothread?id=98713, I noticed some guys are giving GM synchromesh fluid a good rep even next to Redline MTF and Honda MTF. Anyone here heard of this before & experimented. I’ve still got a 3rd gear grind at high rpms even after switching to Redline MTF…

I figure it’s worth a shot…how much can 3 quarts of GM tranny fluid cost?