I have a regular step that I used for training clients when I had my studio years ago…. I still keep it in my work space for choreography. It has lasted extremely well in spite of being quite old. A really well made piece of equipment.
I do not know the easy tone, but took a look online. I agree with the others that your choice should reflect your degree of experience, what other equipment you own, and what activities you wish to do with it. I also agree with Christine that if you are more of a beginner the regular step may be a better investment.
For me personally I prefer getting something simple, versatile, and well made (and with years of research on risks and benefits) rather than the latest cool gizmo.