I have their older 700MHz unit (single core) 2 GB of memory I bought not too long ago (of course, that is how it always works). So far the unit has actually exceeded my expectations and is a lot of fun to play with. For me I wanted something that I could install Kali Linux on (the successor to Backtrack Linux) to do some simple type attacks on a network (I teach part time at a community college an information security class).
First what I don't like:
The shipping comes for Isreal. The price of shipping is $30 which raises the cost of the product.
That they came out with a new one shortly after I already bought one that includes a lot of features I wanted.
What I like:
Gigabit ethernet
They have this thing called u-boot which is pretty slick. You stick a file on a usb memory stick and stick it into the top USB port. Connect the ethernet and then boot up and it asks you what OS you want to install. You can select Ubuntu, Opensuse, Fedora, XBMC and a bunch more and it just installs them to the SD card. Very slick.
It has the ability to serial into the unit so you don't have to set up a mouse, keyboard and monitor to install OSes. Works in Linux and Windows (with putty fine).
I can then do SSH X forwarding really easy from the network if you want a GUI.
I have been able to run a slew of python things on it and the performance is reasonable. I really have been having fun with it.