[eb0la]

I bought several "contact us" style software. Usually their licensing is hard to calculate and you will need to buy more licenses upfront from what you think you need just in case.

Worst experience was a reporting tool for telecoms that was licensed by port. Devices used to have 4-8 ports but the year before suddenly it was feasible to ship 32-port devices to customers. This made the tool prohibitive.

My best experience was when a sales rep just called and told me the pricing range for their product: 5x our budget, without counting cost of migration. It was the most productive sales call I ever had.