Somewhat more difficult to handle compared to another, much cheaper 3D pen that I have used in the past.

While the other one had a button that released material as you press it and independent analog speed adjustment, this one requires button pressing to start-stop and the speed is adjusted (with buttons) only when it is stopped. As someone else mentioned, the minimum speed is still high.

Initially, I was not comfortable with the position of the start-stop button (it was on the thumb), but now I hold it upside down so that I can press it with my index finger and everything is fine.

When stopping, it retracts a bit, which initially gave me some trouble (I thought they did not consider that it would be difficult, they probably thought "since that's how 3D printers do it, let's do it too"), but in the end, it might be for the best, as the other 3D pen used to clog several times as far as I remember.

In the instructions (see image), it mentions a "pause" button, which, however, does not exist anywhere on the pen.

Also, as others have mentioned, the suction cup of the base does not hold well. The other 3D pen I mentioned simply had a larger base... But it doesn't matter, I will probably make a bigger base with the 3D pen

I truly believe that it is one of the best 3D pens. After several continuous hours of use, it has not had the slightest issue and works like the first day.