Kendo UI vs. ExtJS or other frameworks?

We've been trying to identify a framework we can use to replace a traditional Windows back office application with a web-based equivalent which ideally we could build on Rails.

In the process we've been evaluating Sencha and ExtJS but found this post here https://news.ycombinator.com/item?id=7152922 (amongst others) which practically mirrors our own experiences.

The sample applications and controls are obviously what attracted our attention. Specifically inline editable tables like this: http://dev.sencha.com/extjs/5.0.0/examples/grid/row-editing.html although weve also been inspired by both of these: http://dev.sencha.com/extjs/5.0.0/examples/desktop/index.html and http://dev.sencha.com/extjs/5.0.0/examples/portal/index.html

I'm hoping for your opinions regarding KendoUI IE do you use it? do you like it? if you had a choice, would you use it again?

Is Kendo UI any better/worse than others frameworks regarding usability, functionality or even the learning curve?