I bought one of those, as at the time, they were the only way I could get a Darlingtonia... But I DID successfully separate them, almost immediately in fact. The three plants were crammed in there very tightly.
The Darlingtonia was large and healthy, and is now in a 7" pot, sending up new pitchers. The D. adelae was small, I moved it to a 3-1/2" pot and it is much happier.
The VFT was another story. The plant was small, and having been crammed in under the Darlingtonia, the leaves were growing deformed and the traps were toothless. After repotting, it is starting to do better, but the new traps are still small, and the leaves are long and twisted. I only hope it recovers.