I bought this for $47 from HN thinking it would be a heap of almighty crap, but actually I use it quite a bit and it was definitely worth the buy.
I bought this case from Aliexpress:-
http://www.aliexpress.com/item/Micro-USB-8inch-keyboard-case…
Its of fairly marginal quality, with a lot of flex in the keyboard. However it was one of the few options with a USB keyboard, and once I cut out a bit more of a gap in the back cover to enable the clamp to clamp down more it fit fine. Im not sure if anyone has found a better keyboard case with this tablet?
Also installed W10 following the instructions on whirlpool from Mannimal. This is a much easier method than trying to get the Insider Preview version working:-
http://forums.whirlpool.net.au/archive/2435398
This makes a significant difference in performance, and also frees up 3-4 gbs in disk space. Highly recommended, just be patient with the upgrade process. Dont bother with the full reinstall method that some are attempting as there is a lot more hassle that way with various drivers.
Also, if anyone is having trouble installing certain apps on Win 8.1 with Bing (like Freshpaint), I was able to resolve that by installing VLC for Windows, as per here:-
http://answers.microsoft.com/en-us/windows/forum/windows8_1-…
I bought this case, no mods required.
http://www.ebay.com.au/itm/291176302745
Haven't installed Windows 10.. (partially due to time, partially due to fear)
Very glad to hear that it works well and even more importantly free's up space.