Hell yeah, good to see grip people here. I messed with grippers a few years back. I've closed a 3.5 from a parallel set (MMS), and have closed an average 3 using the credit-card set. I hate the credit-card rules — they're brutal if your hands are under 7.5-inch. Funny thing: when I trained seriously about 12 years ago I only got to the 2.5 and stopped, then five years later I randomly picked them up and closed the 3 without training. A few years after that I barely closed the 3.5. Even though I didn't specifically train to go from 2.5 to 3.5, I did put on about 50 lbs and got WAY stronger in the gym.