Digital signatures are a computerised form of signature that verifies that a package was sent by a certain individual or business, or that the right person actually signed a document. These signatures are secure and legal, and they can greatly improve your security. However, as with any sort of technology, there are downsides to using digital signatures.
Digital signatures, even some of the simpler ones, come at a cost. You must have the necessary software to encode the signatures, and if you're using hardware so that customers can sign physically, then the cost goes up even further. Digital signatures are an additional cost that should be weighed against their potential security benefits.
Training and Troubleshooting
If your employees aren't tech savvy or simply aren't sure how to use a digital signature, then you'll have to spend time training them about how the signature process works. This will take them away from their jobs, costing you money. Additionally, as with all computer-related applications, sooner or later there will be a hiccup in the system and you'll need someone to troubleshoot. If none of your employees can find and fix the problem, you'll have to hire someone else to do it.
Digital signatures are a great security feature, but that doesn't mean they're a necessary one. If you own a law firm that deals in confidential materials, you might want to invest in a digital signature application for your clients. However, if you own a small family business that deals primarily in cash, you probably don't need it.