Repetition. Too much and you'll seem ignorant of your subject.
Do's and Don'ts
DON'T repeat yourself.
DO keep it simple and direct.
DO SCRIPT: Investment Manager: Our software is very advanced, years ahead of its time, [Hesitates] Progressive... uh...software.
DON'T SCRIPT: Investment Manager: Our software is advanced; we're currently one of only three providers in the UK to use it so far.
Rather than repeat yourself make your first point count.