Several observations. Keep in mind that they come from someone who enjoys sketching on the iPad and has zero talent. So take it for what it's worth.
Apologies to those who use it (I haven't) but the Alupen strikes me as a triumph of unique form over function. I understand the desire for a somewhat heftier instrument than most styluses, but I think a round shape is more comfortable.
I use the iFaraday Artist model (
http://www.iFaraday.com) with an extra firm tip for sketching. It's long, thin, and has the feel of a brush. I use the "RX" model for notes. It feels like a fountain pen in my hand. The iFaraday styluses use a conductive fabric over a foam base and have zero drag. I like the design very much.
Another option I haven't tried is NomadBrush, apparently designed specifically for sketching. As the review below notes, though, the limitations in various styluses have at least as much to do with the constraints of the drawing apps as with the design of the stylus.
http://www.ilounge.com/index.php/reviews/entry/nomadbrush-llc-nomad-brush-for-ipad/
