I just put in Syncromesh last weekend and I love it. One thing you might want to make sure of, did you have the car level when filling the tranny? I know someone else who left his car up on jackstands after draining and put way too much fluid in because the trans wasn't level. His car shifted like ass until he drained the appropriate amount out.
If you think there's too much in there, just undo the bolt from the top with the car sitting on level ground, whatever drains out was more than you needed. After multiple attempts to pump out as much as possible, I got about 2.5 quarts back in of the new stuff...
This is the first negative review of Syncromesh I have heard from any car community, not just SHO.