Learning curve for the most part was OK, the tutorial videos on youtube are helpful, but sometimes miss required things. For example took me a while of trial and error to be able to encrypt passwords before storing; something that should be standard.
There are quirks in the platform sometimes too which can be frustrating, suggest you contact support over them and continue working on another part of the project while they respond. Hopefully these will be added to FAQs / documentation as tickets are lodged...
On the whole support has been so so. Staff are polite however there is alot of back and forth to obtain a satisfactory outcome.
I have a fairly basic app which features a shopping cart; currently in the process of deploying to my own server to conduct further testing. Getting the backend working on my own environment has been challenging and I have spent far more time on a linux command line than I would of liked.
PreviewIT app works fine on my devices, what challenges are you facing? That said I can no longer find it in the Playstore