I've had mine on for a while now and can also say they are a must. I use a twisty, bumpy road on the way to work and having the spacers fitted really does reduce the wobble when cornering on the bumps. They make the bike feel much more lively in a way and no more wollowing.

I also find when riding at night that the light doesn't dip so much when I hit the brakes and I can still see where I'm going which is a rather good plus point I reckon. Definately a good mod Kev. Nice!