I wouldn't call it a step backwards, because you're putting more focus on the smaller muscles. You won't be able to lift as much though, because you won't have the grip strength to do it. When I was playing around with them I went from 35/37.5kg single arm rows (sets of 8-10) to struggling with a set of 8 at 25... It wasn't that I couldn't lift the weight, I just couldn't hold it. Not a bad option though just to do one day a week, or throw in with a couple of exercises during your workout. Whatever floats your boat, but I was definitely feeling my forearms the next day.