I remember those. I used one in high school. I think I saw one at the gym not to long ago. So yeah, they're still around.
Inherently I don't think there is a problem with them. The concept is no different than a spider curl, preacher curl, or standing with a back against a wall and curling.
However, IMO a curl is a curl is a curl and I think people waste too much time, effort and brain power thinking about curls and what variant to use when.
Zdravko Veselin Gaeta
I am not a powerlifter nor am I a bodybuilder. I just want to be big and strong.
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Make gains, not excuses.