Nice study training board. Build quality feels solid. I've only been using this for a few weeks now, but don't hear any creaks or cracks that might suggest a product flaw.
One slight downside is, if you wish to train one-armed pull-ups from a jug hold, it takes a little positioning to not have the sides of the door frame get in your way. Two ways around this would be to buy the training board with a third jug hold in the center, or installing this on an overhead beam (vs. a doorway).
This review was written in the old system and had content requirements that are different than reviews written today.