I have a 2000 OBW with 5MT. Ever since I've had this car, I've never really had a consistent smooth shift from it. I've owned it for 8 years and shifting has remained jerky since the beginning. It's not a matter of how smoothly you can operate the clutch, I've tried various different clutch release and engagement speeds and I still often get a jerk when going into gear. It's especially noticeable in the lower gears, when going from a dead stop into first, from first into second.
I just got used to it over the years until recently I played with the tire pressures a little. I put 34 psi in the fronts, and 32 psi in the rears. I did this for other reasons, but I was surprised to find that the shifting had smoothed out completely! The car wouldn't jerk around no matter how sloppily I used the clutch! This worked for about 2-3 weeks, until I started to notice the car was jerking again from time to time. I checked the tire pressures, and sure enough the air pressures had gone down in all of them by different amounts. So I filled them up again to their previous settings, and shifting was again smooth.
I put in more in the front than the rear because the engine puts more weight on the fronts.
Yousuf Khan