I suppose it depends on your company/site. Our internal audits tend to be short (1-2 hours including write-up), so we probably don't need a software solution. However, I have worked at substantially larger sites when an internal audit would take 8-10 hours. A well designed software package would have made life easier.
One way to find out would be to trial the software to see if it has the functionality you require, and how you can adapt your style to the constraints imposed by the software package. You might find it doesn't suit the way you prefer to work, or that it's not easy to capture the information your particular site requires. On the other hand, it may make your life very much easier.