What do you like best?
The best things that can be found in the software highlights:
Do it once, deploy anywhere.
It can develop native applications, hybrid with kendo, hybrid with apache cordova, in the same environment without additional downloads.
It has an emulator where you can preview the app.
The compilation of the project is done in the cloud, so it is not necessary to have a mac to generate the app.
What do you dislike?
There are some points against as:
Internet connection to compile the project is necessary.
The emulator is not native, is a simple web viewer, where you can not try all the desired features.
The documentation despite being extensive, has gaps, mainly in basic functionality. For example, you do not have documentation on using social networking api.
The community around the product is low.
Its UI has not been updated to Google's material design.
Recommendations to others considering the product
Before purchasing the license, I recommend trying the software, or common tasks according to the needs of each case, to finally acquire or not the software. There are frameworks that do the same and better, but buying other hardware is required to reach the same point.
What business problems are you solving with the product? What benefits have you realized?
I am currently developing a hybrid mobile application where access to a restful couple information service business system.
One of the requirements was that work on phones with android and ios operating system.
In this part Telerik AppBuilder met its goal and could develop the app. However, it was desired to add login using facebook api and not integration was achieved since the official documentation is too poor to fix it.