Austinwrote a review of Black Diamond Forearm Trainer on November 1, 2013
Familiarity: I've put it through the wringer
I bought this tool for long trips in the pickup, as I travel for work. I mainly use it to maintain finger strength when I can't hit the hangboard for a bit. It will become a little easy after about a weeks use, but there are plenty of ways to get crafty and work the fingers. If you're looking for a forearm pump, I'd suggest a hangboard.