Again, all of these comments are generalities. We prefer a careful study of your individual situation prior to making a recommendation. Your true cost is not the few hundred or thousand dollars for a product. The true expense is in the conversion, adaptation, and training. If the system fails, you must add the lost billable time.
Most vendors have self-running demos.
Some vendors will allow trial periods of 30 to 100 days. If you are like most busy firms, however, the ninety days expires and the software is still on the shelf. Rather than fumble with software that is foreign to you, you may be better served by obtaining the services of a legal consultant. Legal consultants typically know the reputation and capability of local dealers and products. While the consultant analyzes your workflow and needs and protects your interests, your busy attorneys can continue to bill.