The Varigrip is a rather good quality hand exerciser which works very well, the packaging comes with instructions on different ways to be used making it a very versatile way to strengthen different muscles in your hands and produce endurance. On the negative side though, the actual quality of the device is worrying. Though the device is well constructed being quite firm with no rough edges. When pushing down the springs, doing so accidentally at an angle doesn't push them down properly and it looks like they are being pushed out of their proper place. Also I have only owned the product for 2 weeks and the 'd'Addario' text on the side of the product has nearly already been rubbed off. If you scratch it on purpose, I can see it won't take long until you rub the whole text off.
Overall the product works and does so very well, but I do worry and question how long will this product last before it doesn't function properly