Ordered a pricey toy from UK ($136 with shipping, perhaps if $ improves can be a $10 savings). Arrived within a week. It's designed to mimic the motion of reverse bending. I was always curious about bending, but also to lazy to go to Home Depot to buy supplies. I asked David Horne (for those that not familiar with gripboard, arguably the top contemporary gripmaster) to supply me with the "pussy" 20% weaker spring (compared to the original one). The spring is similar to those provided on the Ivanko spring gripper. There are 8 prongs for 8 ajustable levels.I have a decent level of strength (deadlift around 450, squat 350, bench 250, close coc#2), but on the easiest level with the pussy spring I can only get it halfway to 45 degree bend. I do not have pads yet, and they are a must for this activity, as it gets painful on your hands. I've done roughly 10 attempts with each arm, I feel soreness coming on in my forearms. Also it seems to be an addictive type of tool as I'm having hard time putting it down. The only drawback I see with it is the price.
Horne's tool is off the fucking hook. I was messing around with it at the Michigan Grip Champs 4, and it was well built, and too hard for me to bend until I got really warmed up and into it. I am a complete pussy bender, by the way.
If you're into it, it'll probably save you money on steel in the long run.
Looking at the design, I don't understand why it's only for reverse bending and not overhand. I've only bent a very little, so maybe it's obvious and I'm justmissing it.