NWF itself is quite polished and very easy to work with. You get all the dev tools you know from Chrome – the debugger connects directly to the console. "Porting" my game was very straight forward for the most part.
However, the hardware setup was clunky. You're swapping out SD cards to install images with the system software and the account setup is really tedious.
The worst part was the whole paperwork you have to wade through. The game submission process is as manual as it gets. There's no nice web interface to tie it all together - instead you're writing emails, filling out PDFs and Excel Sheets(!). Hundreds of emails.
I can only hope that they improved the paperwork part. This was all about 2 years ago.
[1] http://phoboslab.org/log/2014/07/xtype-plus-an-html5-game-fo...