My personal opinion on changing parts of the car, is don't. Unless you need to upgrade them (i.e. the current part is actually performing sub-optimally), or unless you plan to do event X and some one who knows actually advises it.
Changing brake friction material might give a perceived improved reaction to pedal travel/force but you are also beginning to play with the brake bias front/rear, you may also be generating more brake dust to clean off, and possibly a more corrosive type of dust. Plus we've had the sticking to the disk comment for the previous poster. Then there is the performance difference cold to hot for the more competition type materials to deal with also.
I sprinted my Austin Healey Sprite for 2 years and ran standard pads without a problem. I'm preparing my Ace for sprinting and have also fitted standard material. The brake disks on an Ace are generous for a 800kg car and they not shielded, so just comparing one car to another I think there will be lots of braking capacity on an Ace.