Difference in tranny oil

Right now I have some cheap ass Coastal 80W-90 gear oil in my 5-speed transmission...what differences would I see if I put the good stuff in? and what brands are the good stuff? (i can't think of them off the top of my head)

Redline, mobil 1, synchromesh are good brands that I would use.
Using good brands you will see less wear, less grinding, smoother shifting, etc.