Any reasonably good quality make should be fine, just make sure the caliper pistons are not sticking and the caliper slide easily , also that the discs are not corroded and generally in good order, clean with a full contact area. Unlikely but you haven't got any stupidly over size wheels and tyres on, as I have found that cause a lack of bite when doing an emergency stop! Remind the tester that it doesn't have a servo as many are used to a light pedal. When I was at college I was told a brake servo doesn't improve your braking, it only reduces pedal effort!!!
Try giving the tester Diving boots