These are great--much higher quality than other products I've seen on the market. They are nice and sharp, and strong enough that I feel confident I can crinkle cut many different kinds of vegetables. The grip helps you feel confident that you got a handle with the cutter as these kinds of kitchen utensils could be very dangerous.
We have another one of those that is much stiffer and not as bendable. Not sure why the manufacturer cheapened it up, but it will probably not last very long.