I'm using Redline MT-90 in my '07 Corolla. On the Corolla boards, that's the #1 recommended manual transaxle lubricant.
In my own car, there was a 100% improvement, and the old stuff wasn't really even dark (only 20k miles on the car when I changed it). The shifter is just snick-snickity smooth now. It glides in and out of gear with just a finger tip's effort. Cold shifting is probably 50% improved, but what I was surprised about was the warm weather shifting. It's 100% better. I can't recommend this stuff enough.
I bought my 2 quarts (the Corolla takes 2 quarts EXACTLY) from Redline directly. $15 each shipped, so $30 for the whole deal. It took about 10 minutes in the garage to change it. Super super easy. I tried finding local Redline distributors, but had little luck finding anyone who would sell me less than a case.
Good luck! You'll love the MT-90.