You get 2 hemos, 2 quickclots & 4 bandages which can heal around 140 HP, only 10 off of healing the Pro D Class fully, which means the job itself would be able to withstand almost around 300 HP if the person playing gets the chance to heal. Also any of the donator pistols can be good if you can aim properly with them, I'd say the only big competitor here would be the winchester or the thompson contender, but both could be easily be taken out by Riot Control.
Also again, Pro D Class can constantly keep fighting, custom classes have to wait 1 minute intervals each time they die.