Today I finally got a Flame to use as my main phone (what they call dogfooding, but it sounds atrocious to me). I had been using a Flame for testing since June or so, but I kept flashing nightly builds and let me tell you... it's risky at least.
Sadly I was busy attending other matters (namely the DevTools meetup which is happening this week at the London office) so I didn't have much of a chance to experiment on the phone.
My main goal was basically flash it with an updated version of the operating system, since the Flame comes with 1.3 and I wanted to use 2.x. Then I took my SIM card out of my Android Nexus 5 and put it into the Flame. Bam, it works. Including data! No need to tinker with GPRS and APN settings and what not. Sweet! I already even got a spam call advising me on how to claim compensation on that accident I never had. Yay!
I also imported some of my contacts from my Google account. The importer lets you connect to GMail and then loads the contacts, and you can go through the list to choose which ones to import. Good time for some pruning of old contacts I haven't spoken to in a while :-P There were some weirdnesses on the rendering but I didn't file a bug yet as I want to compare with the other phone and a freshly flashed version and see if the weirdnesses have been fixed or not.
I can also confirm that the Twitter "app" (it's actually more like a glorified bookmark for m.twitter.com) for FxOS is as terrible as usual. I keep internally whispering to myself: OAuth, Oauth, tokens, rate limits each time I try to use the Twitter app and get frustrated by how badly it works on every single mobile browser, so as to scare myself and avoid writing my own client with support for offline and push notifications.
Now I have to find out how to configure the alarm clock. If it doesn't work I'll be late to the office tomorrow---it won't be my fault! :P
Oh and before you ask: no one at Mozilla is forcing us to use this or that phone. This is just done on my own volition because other platforms keep creeping me out and I'd rather contribute to something I can trust.
PS I don't actually have any grand plan for writing a long series of posts on my experiences on using the Flame as my main phone so don't get too excited, teehee!