Not to use as a ballpoint pen

The design and the soft tip for smartphones are great, but the mine as well as a purchased spare mine went limp within less than a week. Today I write not much. Both mines have not even kept up a short school day with me. After the ball was as "bogged down" / "stuck".

The erasing of writing was great. They also did not appear for a konferences in the freezer, unlike the Pilot Frixion.

I wish the product would work longer good. Unfortunately, I have now bought the pen and the refill only for the trash at a large drugstore discounter.
Overall, the two mines have each held less than one A4 closely written page.

2 Points:
+++ Idea
--- Durability