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Yes, I have. I have the Jot Pro purchased originally for my iPad. I wouldn't recommend it for the KF. Its behavior is a bit puzzling. Let me explain.
The Jot has some (widely reported) problems with missed strokes on the iPad. However, a very small dab of conductive grease where the point of the stylus snaps into the surrounding collar more or less resolves that problem. However, I've found on the KF that the missed stroke problem is VERY severe, even with the fix that works relatively well on the iPad.
Sorry to be a wet blanket. The stylus, itself, is very attractive. I like its weight and feel better than any stylus I've tried. (And I've tried a bunch, believe me.) But unlike the other styluses I have that more or less (a bit less, actually) match the performance on the iPad, the Jot is practically unusable for any "sliding" motion.
On the other hand, I would recommend any of the styluses from iFaraday.com. They use a conductive fabric rather than a rubber "ball" and work quite well on both the iPad and the KF. (Not affiliated with the manufacturer, by the way.) The fellow who makes them is very responsive and supports customers well. Can't speak for him, of course, but I know of several cases where he has offered to return or replace styluses that people find wanting for one reason or another.
In addition to the iFaraday styluses, I have several others from Targus, Rocketfish (Best Buy brand), and a couple of no-name manufacturers. All work relatively well on the KF but not as well as on the iPad. That's the difference between the engineering and attention Apple puts into the iPad, I think, rather than any significant difference in the styluses.
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