I didn't even know these existed. Had a look and found lots of different ones at different price points. Also, watched a video review for Z-Ropes which can be adjusted with 3 different springs for different intensity workouts. They also talked about the handles being upgraded from previous versions for better comfort and durability, so I guess that is something to consider between different brands of cordless battle ropes. I can definitely see the appeal though. Standard battle ropes are bulky, need a lot of room, and need an anchor point. I'd be interested to know how these compare workout wise.