There are currently 571 open issues[0] for Handsontable on Github. Each new release breaks something major and we can't wait forever for them to fix the issues. I wrote two blog posts regarding this (without mentioning Handsontable, but it was the library in question):
* http://lauris.github.io/development/2014/08/25/work-and-open...
* http://lauris.github.io/datazenit/2014/08/29/open-source-wor...
These articles may shed some light on why did we start development on our own library.
[0] Handsontable open issues on Github - https://github.com/handsontable/jquery-handsontable/issues