I'm happy to give my general impressions:
Overall I'd say that it is quite a bit better than what you would expect for a £60 smart phone. It works extremely well in some ways but is very limited in others. It is worth baring in mind that this is £60 without any carrier subsidies as well...
It is a great buy for a first time smartphone owner, a backup phone or just something to tinker around with. It will be a truly fantastic buy once some issues are addressed (particularly with the keyboard).
Just don't expect too much from it and you will be happy.
Hardware
Screen - the screen is fine. If you are used to a top end phone then it is a considerable step down and reminds you why you are paying so much for your current phone. Moving from my Galaxy S3 to this is a bit of a shock! The resolution is fine for viewing websites etc. After a while I got used to it. The main problem I have with it is the brightness. It is fine for indoor stuff but is not very visible in bright sunlight.
Storage - there is only 512MB of storage built into the phone. However the Firefox OS apps are tiny so this will go much much further than it would on an android device. Additionally it will take a 32GB SD card (a 4GB card comes free with the phone). This is very welcome. Given the music apps available this might actually make a very decent and reasonably priced smart mp3 player even without all of the other functionality. More on that later.
RAM - only 256MB of RAM. But the phone is FAR more responsive than you would expect a phone with this amount of RAM to be. Switching between several open apps works well. The OS is so light that I don't think I ever had the issue, so common on Android phones, of the home screen taking ages to launch up after exiting a RAM heavy app.
Battery - I've not used it all that much with a SIM inserted but the battery seems to last well. Probably better than my Galaxy S3.
GPS - this is a bit of a disappointment. It only really works outdoors. But once you are out there it works fine.
Bluetooth - I've not tested it.
FM Radio - nice to have. Works well. Needs to have headphones plugged in to work.
Software
OS and basic apps - All work very well. Messaging, email dialler etc are all just what you would expect them to be. Basic and not much customisation available but for a phone like this it really isn't necessary. They are quick to use despite the tiny amount of RAM. All clearly very lightweight. I like the Firefox OS styling overall. It is simple and attractive. The music app is particularly nice looking and works well.
HERE Maps - Works well. Provides directions for driving walking and public transport. Also allows you to cache maps for offline use.
Browser - as you would expect the browser is really good. Probably as good as my S3 for viewing mobile pages. Very fast. But the lack of RAM begins to tell quickly on desktop webpages. They will load quite a bit more slowly.
3rd Party Apps - Somewhat confusingly there are 3 ways to install 3rd Party Apps on Firefox OS:-
- Firefox Marketplace - Exactly what you would expect at this early stage. Some big names (Facebook, Twitter etc) but also some missing (no youtube). Some promising games but also a lot of fairly low quality apps - BMI calculators etc.
- Adaptive App Search (Everything.me) - this has a lot of potential and offers a nice way to discover web apps that you might not have found otherwise. Goes a long way to plugging the holes in the Marketplace (youtube and google maps are available via this route). Also grooveshark html5 works very well. The downside is that not all apps here are 100% compatible. I've come across a few that don't work all that well on the Open. This is a minority though.
- Pin Webapps from browser - this helps even more with filling in the blanks. Any website can be pinned from the browser. It then appears on the home screen as an app. When it opens it does so with almost no browser chrome so that it really does feel like an app to use. I've used this for London transport journey planner and bus tracker web apps. Both work well.
Limitations
For me the main issue that I have with recommending Firefox OS to anyone as their main phone is the keyboard. It is currently a very basic qwerty soft keyboard. There is no word prediction / auto-correct at all. However I believe this will be addressed in a future version.
Also Whatsapp is currently missing from the marketplace. This will be a big deal for some. Not so much for others.
Advantages
Software updates should come very rapidly. Mozilla are planning to ship a new version every quarter and security updates every 6 weeks.
Also see here for pcmag review:
http://www.pcmag.com/article2/0,2817,2423926,00.asp
I'll post more if I can think of anything more!
If you are interested I would go ahead and buy it. Have a play and see what you think.