I've got a 700ET (7", I believe the older model)
Under the hood, these are actually a Gome Flytouch 128mb clone. Custom roms with the proper market & more infos are available from here:
http://www.androidtablets.net/forum/gome-flytouch/
http://www.slatedroid.com/index.php?&board=60.0
You'll want a 128mb firmware for build version 1.9_88 / 1.9.xx

(The build version is displayed at the bottom of the first screen)
Not bad little machines for what they are, but slow. For some reason, Portrait mode is even slower still, almost to the point of unusability.
The keyconfig is also a little funky as it lacks the expected hardware keys, but you quickly get used to that.
Mine basically gets used as a streaming radio/ calender/ photo display which it works very nicely for.
Notes:
That the screen calibration normally seems to be inverted with a custom ROM. Two ways to fix this:
1. Navigate to the calibration manually with the inverted screen.
2. In the ROMs 'Script' folder, you will find an 'etc' folder. Download the official Elonex firmware from their website & replace the 'etc' folder in the ROM with the one from Elonex.
The default wifi times out after ~20 mins on sleep, no matter what its doing. I suspect there's a bug somewhere in the works, but with something this generic and chinese, support will not be forthcoming. If this bothers you, use SpareParts or similar to disable wifi sleep.
-Leezer-