I am a graduate student and I write a lot! I have been paperless for over a year now relying on my iPad2 for my stationary needs. I have tried several capacitive styluses such as; Targus, Ayl, Dagi, Adonit Jot. I have also used another similar optical stylus, Cregle's iPen. The ByZero, is a long sigh of relief (as soon as I get over the price). No doubt about it, this is the best you will find to write naturally with precision and accuracy. I absolutely love resting my palm carelessly on the screen as I use my fierce chicken scratch to work out physics problems! The results are identical to using a pen and paper, but I feel like I have a whiteboard that is clean, precise, vibrant and doesn't smell of dry erase marker. Because I have homework to get back to I am not going to write a novel about how much I love this stylus.
I will say that this stylus has raised the bar and was everything I had hoped cregle's iPen would be. The iPen is half the price because it is half as reliable. When it did work as it was supposed to, I loved it! But then when I took my hand away from the screen and returned it, the calibrated dot would be misaligned with the pen tip for some reason; I would have to take away and then reapply my hand for it to snap back (very weird). And then every once in a while the pen would keep writing when when I was not applying any pressure to the tip. It took about a week and trying four different writing apps for me to finally accept that it was not going to work for me.
The ByZero is elegant and reliable! I notice that the sensor piece has the same optical sensor as the Cregle iPen, however, ByZero's comes with an additional two sensors at the far sides of the attachment. This, to my knowledge, helps to triangulate the position of the pen relative to the screen. The more reference points you have, the more accurate your positioning system will be as it minimizes error. I believe this has a lot to do with how ByZero's pen is so reliable and effective, especially compared to Cregle's iPen. ByZero has three optical sensors while Cregle only has one. This also helps explain the "patented technology" ByZero claims on their website (obviously Cregle could not add this feature).
Oh, one last thing: If you are serious about buying this pen, be sure to use the best apps for it. 'Noteshelf' has been my favorite writing app for a long time now, and yes, does work so well with this pen! I was also very impressed with 'Pen & Paper'. 'Goodnotes' was okay (it is in beta testing) and the Studio Basic was lackluster due to the inability to write in landscape mode.
Damn, I said I wouldn't write a novel, back to my life. I hope this helps you guys! I think the customer reviews are the driving force of Amazon so I like to contribute every once in a while.
Andrew