When evaluating products of any kind, it is helpful to know how they will cope with the extremes. Cars are road-tested at speeds and in conditions far removed from the everyday experience of most drivers; the specifications for cameras and similar electronic equipment often include statements of minimum and maximum operating temperatures well beyond anything which you and I are likely to encounter; watches operate at depths and altitudes which we hope never to reach.
The equivalent extreme in eDiscovery terms, apart from the ability to handle very large volumes, is a war crimes investigation and tribunal. The data sources are often far removed from the neat corporate environment of servers and laptops; the events took place in circumstances where data preservation was the last priority; the required standard of proof is a criminal one. If your information system is capable of managing those implications, it is almost certainly good enough for your case.
Well-known technology analyst IDC has produced a report called ZyLAB: Enabling Prosecution of the Unspeakable on the technical and operational issues faced by the United Nations information management team in various war crime tribunals, drawing parallels with commercial eDiscovery projects in civil litigation. ZyLAB has been heavily involved in many of these investigations and continues to be so.
There is a press release about the IDC study here with a link to the report itself.