Installed both the upper and lower inserts today. I turned on the car, shifted into 1st (I drive my DSG in M exclusively), let go of the brake a little and felt this buzzing vibration pass through the car. At first I thought what on earth is going on. Then I started driving. Noticeable vibrations at speeds up to 15mph. I feeд like I'm driving something with 700hp under the hood at very low speeds.
At higher speeds the vibrations feel very stock. I cannot say they feel stronger than before. Well, maybe 10% stronger, max. Vibrations during acceleration are a little amplified, but not a lot.
Now about the good stuff.
Gear shifts are super seamless. Before I would feel 1st to 2nd very well. Same would go for 2nd to 3rd. Now I cannot feel them at all. Interestingly, I can hear very slightly the shifts from 1st to 2nd and 2nd to 3rd. I cannot feel any slop. I think this combo feels much better performance wise than when I had just the lower insert.
I'll see if it breaks in a bit and the vibrations decrease. If not, I'll have to think whether to keep the combo or try something else.