Hi there, the basic issue is that our users refuse to use webERP because its god-awful to look at. Our management agrees and they can't use it either so that's why I built the front end using ExtJS. ExtJS is not as bad as it seems. I built custom distros of it that only uses the pieces that we need so the footprint/hardware requirements is very small. I also implemented some keyboard shortcuts but that wasn't a requirement for us.
FA is an improvement in the UI, but again, our users are used to the friendly UI of Quckbooks and find webERP/FA too difficult to navigate. Please don't take that personally, I'm a techy and totally comfortable with command line etc. but I don't make the decisions for my company ;-).