Over the course of a few hours spread out over the past week, I have yet to get the most complex spaceship put together. At various stages of construction, I've literally had the ship come apart in my hands as I've tried to apply the proper pressure to get the bricks to lock -- something I've never had happen with Lego bricks. The frustration is so great that I've been tempted to toss the completed segments against the wall in a fit of anger. I don't even want to begin to imagine what a child might feel when encountering the same problems.
So, this will mark both the first and last time I buy a Best-Lock set for Tank. Hopefully, it won't be a complete loss and when they're mixed in with Lego-brand bricks maybe adhesion will be less of a problem. However, it wouldn't be surprised on bit to find us tossing many of the bricks from this set as the years go by.