I ride the force and I'm really happy with them. I checked out the Arenas and the straps are very similar to the Union. I just dont now how stiff/responsive they are compared to the Force bc I've never ridden them.
I have the arenas and they are the best bindings I have ever owned. Responsive and soft. I did need some time to get used to them tho but thats because i got a whole new set-up and the board was a bit longer than im used to. 08 Burton Elite, Forum Arenas and Northwave SL boots. (the boots are so confy, its the best bang for the buck)