Great product
Looks and feels like the stylus that came with the DSi, but with the added bonus of being able to extend it. Now it fits better in adult hands. The tip is made from the same material as the original NDSi stylus, so no risk of damaging the screen. I highly recommend it.

Nice Pen
it's good to have it than the original one and it's comfortable then the original one too, because it can be pull longer.

Touch Pen Long DSi - Product Review
Better then the normal pen since it is longer which is good for adults or anyone with big hands.
Highly recommended.