What questions should I ask in a SaaS vendor demo?

Best questions to ask in a SaaS demo: How does your product handle [your specific workflow]? Can you show me a customer with a similar use case? What does implementation look like — hours, weeks, months? What are the most common reasons customers churn? What does your support model look like? Can you show me the data export process? What is the roadmap for features we discussed? Good vendors give honest answers; evasive answers are a red flag.