Finally I have good news, for me at least.  Took delivery of X3 today.  Direct BA order paid 3 Dec.

The units certainly look nice and came with a power cable (for what that's worth, but still nice).  There are a few issues, so even with it being nearly six months late (and worth maybe 25% of the purchase price), it doesn't seem to be a finished product.

Power on without ethernet connected = it doesn't work, fans run at full speed (and it's incredibly noisy!) but nothing happens.  LCD lights up, nobody home.  Buttons do nothing.
Connect ethernet whilst powered = weird stuff happens, but it doesn't connect to the network.
Power cycle = problematic, PSU shows "alert" indicator but system not responsive.  Fixed by turning off the power and removing the PSU.

LCD seems wasted right now.  It runs Android 4.2.2 but does nothing interesting.  Leave it for a while, the screen will turn off (like any Android phone/tablet) but then it doesn't seem to be possible to activate it again.  None of the buttons below the LCD seem to do anything except Power, which does turn off the miner - but then you have to actually power-cycle the system to get it up again!  At least when I did it this way, the system did come back without issue.

Web interface - system defaults to using DHCP, which has the benefit of working for most people who may not have 192.168.1.x subnet, but means that you need to find it!  Once you've done one, it will find others by itself, which is handy.  My router lists the miners as "android-0123456789abcdef" (unique 16-digit hex code).  If you don't have DHCP?  I think the answer is probably get DHCP!

By default, device starts mining.  No pools are configured, but it mines.  Possibly "benchmark" mode - speed is higher than you get in reality, but who knows really?  I can't get a terminal session to look at the configuration directly, log in is not the same as for the web interface.

Sync Network option is either flaky or just doesn't work.  I tried it, in order to copy the configuration from first unit to the second, and although it appeared to work in the web interface the second unit didn't actually get the configuration.  I ended up configuring it separately any way.

At default "1000Hz" setting it's using just over 1kW.

If this had been delivered in March, I'd be quite pleased.  But it wasn't.