Ralgha, I had the same experience with them. They really do make a good difference in how the damper acts. I think I went with 0W fork oil when I did them rather than 5W.
You're right, theoretically one should also drill their damper rods when using these, but the light fork oil seems to work well enough. I ended up selling my bike before I was able to get around to playing with drilled damper rods though.
Glad you like them! It's amazing what a little help on a damper can do.
