These guys are taking a nice relaxed, light pace. They're practicing with a longsword vs montante.
I'd love to get a steel trainer for this. The montante is a longer, strictly two-handed sword as compared to a longsword (the Albion Dane is in this size class). The spadone is more massive, though not necessarily any longer than the montante.
The larger two-handed swords are like a force of nature, particularly the spadone, which typically would weigh between 5 and 8 pounds. They have to be kept moving, in fluid arcs, and frequently their own momentum is all that's needed to blast through someone else's attack or parry. In fact, some of the techniques are designed to fend off multiple attackers at once.
A&A makes some good trainers for this, but there are other cheaper alternatives as well. The thing is, though A&A costs a bit, you know you're getting a solid, quality trainer.