Paul Rwrote a review of So Ill Holds Iron Palm Training Board on January 27, 2014
Familiarity: I've put it through the wringer
The climbing gym I go to has this board and I've been using it fairly regularly with a large amount of success. You can get a good overall grip workout from it. The different edges allow you to work a wide range of open hand/crimp holds, with the jug at the top, a small slope/crimp, and a couple in between. The slopers are pretty rock solid and they are big enough so you can vary where you hold them to increase/decrease difficulty. The only drawback are the pinches. Since they form opposing holds it is easy to engage your shoulders so you kind of cheat out your forearms out of a true pinch grip but if you keep yourself focused you can pretty much negate that drawback.