Looks like its the same fork as used on the Primera which is spec'd without a disc. So I doubt there will be a ride difference versus rim brakes and a steel fork.

Front disc prevents you from using Co-Mo's carbon fiber fork, which likely would make some difference in the ride.

I don't see the CF fork as an option on the Speedster, so you might have to go to the Supremo if you wanted a CF fork anyway.