Is there such a thing as a user-friendly ad hoc query tool for BI?

I'm looking for a truly user-friendly business intelligence (BI) tool for enabling business users to perform genuinely ad hoc queries. What are your views? I find suppliers are often over-optimistic about ease of use.

I would agree that BI vendors typically will advertise their platforms as easy to use, but ease of use means something different to everyone. We find that only a small percentage of business users actually want or need ad hoc query capabilities. Most users only need interactive reporting or data discovery and/or data exploration capabilities. Most BI vendors have these tools, and I would argue that they are intuitive and easy to use, especially if they are configured properly with the correct user audience in mind.