Pfff.... do they support 64GB? I'm rocking a 128GB PNY Micro SD inside my LG Volt, works nicely with Link2SD. I have the card with three partitions, first is a 2.5 GB Fat32, second is a 114 GB Ext4 for Link2SD, and the last is a 2 GB Swap to help low ram situations. I bind any directories to the second partition whenever I need more space. I'm not using CM12 at the moment but I'd imagine it would work the same now that the other CM11 Rom has the same CM12 kernel from Bad_MOFO_33.