I've been using asn.1 for 20 years now, and i find it absolutely fabulous. I still learn something new from time to time, when something doesn't parse or encode correctly :)
I have, but it doesn't work out or i haven't found adequate tools for my programmer's task. Most of the apps can't be full screen, fortunately there is dexmax app to fix this. Overall experience for some serious work is not good, but for surfing it's fine. I succesfully used rdp to connect to my desktop computer :)