I have tried a whole bunch of handwriting apps and I've blown a whole bunch of cash on several too. I couldn't find one that worked so I settled for using a physical notebook and would take photo's of the pages, scanning them into Evernote (which then hooked into Zendone, my GTD app.) It kind of worked but I found both editing notes on the Android Evernote app and Skitch to be flaky.
So I continued to look for an option.
I can't remember how I stumbled upon Inkredible.
I vaguely recall looking for a handwriting app that has a "palm rejection" facility which Inkredible does. However, it was not the part of Inkredible that drew me.
The first thing was its responsiveness. I use an Adonit Jotpoint and I found no stutter whatsoever. That is a big statement. Every other handwriting app I have ever used has stuttered at some point. Some more than others. Yet with Inkredible, no stutter.
The second aspect I appreciate is the quality of the various "brushes" or tools which include a fountain and calligraphy pen excellent. (Some free, some you need to purchase as an In App Purchase.) It is also able to detect various forms of pressure of your writing device. More pressure, the thicker the line.
You can chose various types of backgrounds (again some free and other an available as an In App Purchase) and the ability to move through your pages using a two finger page turning technique, or by long pressing on the edge of the page to bring up a quick scroll function.
You also have the standard option of sharing your pages into other apps.
As I was thinking about what I wanted to blog about next, I realised that not only have I not used my physical notebook for about a month now, but I have added the Inkredible icon to my main home screen. It is an app I use several times a day and has resulted in less items in my bag. This reflection answered my question. This app has improved my productivity significantly. Give it a crack and let me know what you reckon.