Unlike other pens this one actually works with the fantastic Penultimate App for notetaking. I tried before a Proporta pen (its sticky tip does not glide over the screen at all) and a nameless pen from a big PC store chain which had a failure rate of some 40%. Unusable.
This one works fine, glides easily over the screen and I can write all kinds of notes without problem.
I don't understand why pretty much all of these pens are so short, this one measures approx. 109 mm. But for notetaking its ok, much better than using a finger. Apple' own iPad case has no room for a pen and it doesn't help that I can attach this pen with a clip/string into the headphone port. I could attach the pen with its clip to the outside of the iPad case but that is maybe a bit silly.