I use to send out my completed appellate briefs to be printed and bound because I did not have a binding solution. Not anymore. With this GBC unit, binding is easy. I was binding within 2 minutes of having the machine out of the box. The instructions could have been more clear on how to correctly insert the comb into the machine. After about 30 seconds to sort it out, though, I was binding my first volume. Many, many more have followed. There haven't been any problems at all.
Before I bought the comb binder, I seriously considered a Velobinder. Even though lawyers in my area commonly use combs, I was concerned about the possibility of a comb coming undone in the hands of a judge. That worry, though, was unfounded. It is important, though, to choose the correct size comb.
A couple of notes: One can punch up to 15 pages at a time. However, I found with the 26 pound stock I use, 10 pages was about the limit for relatively effortless punching. Next, the more you bind, the easier it gets. In the beginning, it was mildly tricky to line up the comb with the holes. After binding a few volumes, though, it becomes easy and quick. Finally, there are many styles of covers available from paper to plastic in different colors and thicknesses. I have been using clear covers with great success. My output looks exactly like the copies I would pay hundreds of dollars to have Staples or Kinko's complete.
This product does exactly what it is supposed to do and does it well. Highly recommended.