I ended up buying Dubuque clamps. The trick with clamps is to buy them one or two at a time over an extended period to lessen the pinch. The savings on the cheap Pittsburgh clamps were actually nearly a complete waste. I cannot imagine what I would do if I lost a project at glue up, though, and if I didn’t have spares hanging around when the Pittsburgh’s failed randomly, I know I would have. Luckily, I had a couple pipe clamps and they saved me that day.