The ease of use, how simple it was to implement in my application as well as having such great support for multiple languages! It's not free but I can't see why someone would need this feature if they are willing to pay - everything you want from something like that should be included at no cost or minimal charge (or even better without any charges!).
Very easy implementation process which allowed me to get started very quickly! There isn't much we haven't been able to do so far using handsontable! We have used handotables across our entire business including front end applications where users input information into forms etc., back office systems processing invoices/payments. Everything has worked flawlessly thus far! Using handsontables allows us to provide quick feedback when required via emails regarding changes made by clients who submit tickets through our system. This also helps keep track of what problems people may encounter during their interaction with our website and software.