This pen has all four business colors i need for drafting notes and sketches. Some colors aren't as vibrant as i expected but the convenience of not having to dig for varying colors in the office is a big time saver.

This pen has a very sleek modern design, and has a little weight to it. It outperforms all other multi pens with a knock style system even the rotring 4 in 1. This is a little heavier, which i like because it provides good balance.

I like this pen even after the red ink gave out a day after i received it. I see that the d1 pens are slimmer than others. I just wish the inks were smoother and the green was darker.

Poor craftsman ship along w the shoddy performance hardly makes this a logical choice for you to purchase. Exterior is too smooth. Too heavy.

Kentaur is probably a fine company, but this pen was totally defective. The point selection button often jams and the button actually collapses. That is unless kentaur wants to prove to me that the pen's clicker was a lemon.

The pen's body is very slick causing the pen to slip down on your fingers. The eraser cover is far too loose on this pen causing it to be easily lost. Inks are not uniform. This leaves * indentations that does not have any ink.