I just got the trainer Captians of Crush gripper yesterday. I ordered it from http://www.ironmind.com
All I can say is WHOA! The trainer has 100lbs of resistance. I was suprized to read that they actually recommend using the gripper as a weight workout. I usually sit and watch TV or read with my grippers that I got from Walmart. Not possible with this thing. They recommend doing a warm up set of 10 reps then doing a workout of 3 sets of 5 to 6 reps each. On that last set my grip was fried.
Anyway, I like the gripper so far. I wonder how long it wil take me to work up to the next level. Level 1 is 140lbs of resistance. Level 4 is 365lbs of resistance!