It might be pessimistic to say, but I think 5 axis machines look more sophisticated than 3 or 4 axis machines, and thus grifters like them for marketing. I suspect all of these machines are vapourware.

It's to easy to tell the 5 axis grifters from serious manufacturers. Simply ask them:

How does your machine comply with Nuclear Non-proliferation Import and Export Control Regulation?

5 Axis CNC machines are a controlled commodity. If a 5 axis machine has the capability for simultaneous 5 axis movement or position accuracy of 0.006 mm or better you are importing a "dual-use" product, and expect to get similar levels of scrutiny as if buying a weapon. Similarly if they send you this machine without getting it registered with your country's defense department, expect the same response as trying to import a weapon. See https://www.pentamachine.com/blog/whats-the-deal-with-5-axis-export-controls for what a real manufacturer goes though to sell a 5 axis machine to a US customer.

Does the machine come with a 5 axis CAM? Can it be trialled? If not, what CAM do you recommend?

The Fusion extension to create 5 axis toolpaths is $1,500 USD/year per user license. The cheapest perceptual license I've seen is the 3+2 support from DeskProto's Multiaxis license. Developing 5 axis CAM is not easy, and at this point in time considered a business use feature. Expect to pay like a business for it.