Depends whether the redesign was actually necessary. Websites and software UIs are often redesigned simply because the powers that be are bored with the existing design (through familiarity). The users either don't use the site enough to notice, or are annoyed with the new design because they have to re-learn how to use the software. If it is effective, an EV certificate may have a more positive impact than a redesign which just serves to provide a change of scenery for the developers/management.