What I remember of the V20 was that there was some benchmark (Norton?) that was way faster, but I never saw a difference for any real application that I tested.
I have a soft spot for the V20. The laptop I carried in high school was V20-based (a NEC Ultralite PC1701). I remember a CGA 3D billiards game I played on both the laptop and an XT clone desktop. The V20 was definitely faster for that game.
For most of what I actually used it for (typing notes and playing with QBASIC) I didn't notice a difference.
