I received the mk808 and first and foremost flashed it to finless 1.6 rom. Since then it's worked well. To answer a couple of your queries...
Wifi is not the strong point of these sticks. With this custom rom I get a stable 18mbps wifi link when there is just a wooden partition between the stick and the asus n16 router. Streaming 1080p mkv over wifi from home server was without any issues though.
For a better experience I am using a cheap usb ethernet adapter bought from eBay and a wired connection. Caveat being the ethernet switch has to be turned off and back on following every bootand the status bar still says no Internet connection even though it shows a ethernet symbol.
It can be powered using the television usb port but works best with at least a 5v 2a adapter. Mine shipped with one.
The status bar can be hidden and brought back on will in this rom.
Flash videos work without audio sync problem. iPlayer on bbc is broken though for some reason.
I have not bothered with Skype but lots have successfully used it on other forums.
There is a rom in the works with working xbmc with hw acc and kernel with cpu scaled to 1.4 ghz. Closely following that thread.
So far almost all apps I have tried work well. For a net price of 3k, this is a great device. I had to buy a mini hdmi to hdmi adapter, usb ethernet adapter and a usb wireless mouse to augment functionality. So still a shade under 4k... Very very promising to play with.
Not for those who like things working to order out of the box. It needs tinkering and constant upgrade to exploit the best out of this nifty yet delightful device
tapped on Note II cdma