Update!

Yay! I finally got the blades to work... guess I won't be hassling eBay for a refund.

Incase anyone else gets into the same trouble, download the BFGMiner 3.00 from:
http://cryptomining-blog.com/tag/gridseed-bfgminer/

The correct parameters for BFG miner to detect the blades is:

bfgminer.exe --scrypt -o u -p -d gridseed -S gridseed:all --set-device gridseed:clock=600

You can also tinker with the clock setting from 600 up to 850, but I found that 850 resulted in more HW errors, but I'll play with it some more till I find a good speed without frying the cards.

Also, on a sidenote, if anyone's interested... I have a handy tool for backing up your wallet dat files. No scams, sourcecode is included.
bitcoin.anotherworld.com.au