The Jot Pro is really outstanding. I've bought all manner of styluses for my iPad, which I use at the office primarily for taking notes. When used with a good note-taking app (like Notability or Inknotes HD), the Jot Pro is the closest thing I've found to a pen-and-paper experience.
The cap which protects the tip can be screwed onto the back end for safe-keeping, which is a nice touch. The magnet which keeps it adhered to the side of the iPad is quite weak, however - so much so that I don't even bother with it and keep the stylus in my pocket.
The price point is fairly high, but the Jot is so much better than any other stylus I've used that I think it's good value for money.