Daddario Varigrip

I bought this product only because I had a gift card to use at thomann and thought I'd order some random stuff. The build quality is good, and it's great that you can adjust the resistance. However even at maximum resistance I was able to easily press down each piece, even with my little finger. The simulated strings aren't much use either, they're just string-ish texture on the plastic. I suppose you could use this product if you have very weak hands or are doing some sort of rehab. Other than that I don't this will be usefull to anyone. If you really think you need to strenghten your fingers then buy the cheapest steel string acoustic you can find. It's pretty much guaranteed to have high action and horrible playability. Now play that daily and I guarantee you will get stronger, and you'll actually get to play at the same time too instead of playing with a toy.