I was very limited to the app template. I had to adapt my ideas to the options offered by the platform. It is not very flexible.
Also, I am a user from Argentina. Although there is a wiki to use the platform, I found the instructional videos much more useful, and there are few videos in Spanish.
Also, I think flexibility limitations may actually come from my poor knowledge of the app. The problem is that the sample templates and app that come by default are not good (I can do better!)
I would like to see something like what Tableau does, which has a public dashboard library that I could never do with my current knowledge, but it allows me to understand what could be done, what is the actual power of the product. Review collected by and hosted on G2.com.