I think everyone in the IT industry who has experience in implementing SAP would vouch for that, always grossly underestimating how long it takes, how much it costs, and how complicated it is to automate ERP processes. Sad that the legend for IT project overruns continues, but, once it's installed and working, it is extremely efficient with end-to-end view of the source-manufacture-distribution-sales pipeline. Very sticky as well, once the the customers are hooked, they'll never leave, such is the power of SAP.
They'll get there eventually, if they can survive the pain of implementing. Thinking about it, maybe an investment in SAP itself might be a better choice than their customers. ?