I'm new here, but i'll try to be as helpful as i can, and contribute with what i can!
I've got a komputerbay 1000x 128 Gb yesterday and can't get it to work.
Tested it on:
5d Mark II with firmware 2.1.2
ML 2.3 (tried nightly build and newest day)
Did a clean install and copied working ML files from an 8 GB Sandisk card.
MBS for the KB card is 000000000000000000000
The card is bought on amazon.de and the camera is from simplyelectronics, so somewhat Asian.
--
Any other details you guys need i'll provide it to you right away!

All the best and good work from you guys so far!
/Jonas