i have several in the drawer. all beyond useless.
i use the emulator mostly. when i have to test multitouch or perf, i use an old-top-of-the-line-android that cost me $50ish on craigslist. why? because all the official firefox phones are useless. crappy touch screen. etc.
yeah, they say we should use the device people are using, but the point is, nobody uses them if not for firefox devs! also no hardware drivers when you want to flash some other kernel. just like with a android phone repurposed. so, why???
and if anyone thinks real people buy those, i challenge you. take a plane to mexico where the alcatel one is even advertised on billboards... and buy one. i tried. if you manage to find one at any store, i will reimburse your trip. they dont even sell it! nobody buys it.
in the end, those phones only secure a tiny margin for a manufacturer that would otherwise fail on the android ecosystem. a small royalty fee/donation for mozilla. and lots and lots of wasted time for the dev comunity having to document how to work around the annoyances and binary blob crap of yet another cheap phone.
not to mention the environmental impact of producing yet more phones that will not be used for a few years and then be disposed.