I have tested the trial of HTML5 builder and was struggling, to say the least, to get my grips around how database access works in this environment. It appears to be substantially different to how it works in Delphi. I never got even the most basic database connection up and running and I couldn't get the examples to work either. The RPCL documentation is really bad. One single paragraph for every property is not enough to understand what the property does. Seeing as HTML5 builder is a featured product of the RAD Studio XE3, it is very disappointing to see the state of the documentation.
Secondly, the RPCL documentation needs to be fleshed out substantially! Goal should be half a page of documentaion for each property and method with an example if appropriate, multiple examples for the important stuff.