Here are three reasons to videotape suggested to me by very experienced Miami litigator, Lawrence Shapiro:  (i) Education: Your performance is available for evaluation; (ii) Information: Nuances in the witness’s responses are available in a manner impossible to have from the printed page; (iii) Effect: Many offices have flat screen panels where a witness’s responses can be displayed during the deposition.  Among other ramifications, this can have a disconcerting effect on a witness which might be of benefit to your case.