It is an excellent pen - that erases. It is inevitable for the ink to run out quickly, as it is specially formulated and dense to be removed with the eraser (and be careful, try to erase after it dries, otherwise it will smudge). It comes in many nice colors and styles. I deducted one star only because it is not my favorite pen from the company. But it does its job 100%.

Quite good for its price. I buy 3 pieces and when the ink runs out, I buy 3 replacements for 4 euros. It writes well with accuracy and it is convenient that it erases.

The main disadvantage is that the ink runs out extremely quickly. So much so that I would believe it is used. I can't remember when a pen has run out so fast. As for the writing, I can't say it has a consistent writing quality. In order to write continuously with uniform ink deposition on the paper, you have to reduce the writing speed. The only thing worth mentioning is that it erases without leaving any marks.

Very good. Their advantage is that they write like a pen and erase at the same time with the built-in eraser. If I have to say something negative, it is that they run out very quickly, you have to be careful when erasing on the back page from where you are erasing because it erases what you have written behind (of course, the quality of the paper also plays a role), and finally, they removed the eraser that was on the pen cap.

It is mediocre as the "eraser" on the back smudges several times. The liquid inside is not exactly ink, resulting in notes that I wanted to see being faded. It also runs out very quickly.
Other than that, if the aforementioned flaws are improved, it will be a very high-quality pen

I have been buying them very often for several years. Their advantage is that they write like a pen and erase at the same time with the built-in eraser, and the disadvantage is that they run out very quickly, which makes them expensive in the end (although I only buy the refill occasionally). Unfortunately, it is the only thing that has helped the children for school!

Tragic! If it's very hot or in the winter if you blow on the air conditioner that emits heat, it turns off!! I don't know if something has changed since I bought them, but be careful!