2 of us at work using this adapter: http://www.amazon.co.uk/EasyAcc-Bus-Pow ... =dann09-21
it works great after applying the Bios tweak, HD's, mice, USB sticks etc all mount and the unit keeps charging. Using an iPad charger helps a great deal as the supplied charger isn't powerful enough.
I can confirm that I got it working using this adapter on my Linx7 last night. I changed the two OTG BIOS settings beforehand and I'd also gone into Device Manager and under "Universal Serial Bus controllers", altered the Power Management options for both items listed so that "Allow the computer to turn off this device to save power" were unchecked (someone earlier in this thread mentioned this - not sure if it helped or not though). I was then able to charge the tablet and plug a 360 controller in and use it (although it didn't show under Devices & Printers for some reason, but it was under Device Manager).
If it helps, I originally used an OTG adapter plugged into the double-ended USB cable that came with the adapter and it wouldn't charge the tablet - it only worked after I used a cable I had from a phone charger (USB to micro-USB) and then the blue light came on to show it was charging. I also did a full restart, although I'm not sure if this helped.