I love all the pens I ordered, including this one. Got 10 different ink colors. And I did tried all of the colors to make sure all are working, and they are. I had one cute pen similar to this before, with 4 different colors and instead of using highlighter, I use the pen instead. With this one, it's a lot better with its 10 different colors.
My kids love it. All of the colors work well. Not broken yet, with my kids that means it must be durable. I keep it in my purse to amuse my kids. The girls actually draw and write with it, but the boys just change the colors, over and over...and over.