It looks like a somewhat different design than all the other styluses, and so might work better, but I haven’t seen any direct reviews except their marketing material, which is hardly impartial.
Yes. I own one. It is by far the best of the capacitive styli, hands down. It isn't perfect but is the closest thing you will get to perfect without dropping $100+ for something like the XO[1], which is a bit buggy from what I've seen and you are stuck with their software/SDK. I just won't pay an extra $150 for a stylus. At that point I might as well go the Wacom-equipped Android route.
Even with the Adonit, though, iPad is still no match for a Wacom. It's not even close.
Go on YouTube and just search for Adonit Jot Pro reviews. There are lots of impartial people and accurate action.
While looking for a precise stylus I came across this one as well: http://www.cregle.com/ It looks like it solves a lot of the gripes with normal capacitive styluses, but I haven't tried it.
This is the same hardware as the XO stylus in a different case. Same OEM for both. They look great, the demos are wonderful, but user reviews say that they don't work well in the upper third of the screen and require frequent recalibration.
Interesting, I hadn't seen the XO before. It's too bad these ultrasonic styluses don't live up to the hype. I would love to take notes on a new iPad and ditch the paper notebooks completely. It'd be sweet if Apple shipped a solution, but I'm not getting my hopes up.
If you go to Cregle's iPen Kickstarter page - Comments section - you'll see it didn't live up to expectations. (Google iPen, should be first result).
Calibration issues, broken, etc. I was really looking forward to a precise stylus (pressure sensitivity is number 2 priority to me), and I'm still waiting…
It looks like a somewhat different design than all the other styluses, and so might work better, but I haven’t seen any direct reviews except their marketing material, which is hardly impartial.