Disagree... sort of. Use GM synchromesh transmission fluid with friction modifier. Awesome stuff in Honda transmissions, but it will cost you twice as much as Honda MTF. You should only need 2 quarts too. If in doubt, look it up in your owner's manual.
On the other hand, if you aren't having any problems with your transmission now, don't switch from the MTF if you're not sure about going to the synchromesh. As a data point, I'll just tell you that I don't buy MTF at all.