The DLL fix is working fine on my Crossfire 6870's. Interestingly, the majority of the load is on the secondary card. 99% secondary load and 80% primary. Up from 45%-35% pre-DLL.
Driver support for new games is pretty poor so you usually have to wait at least a month or deal with ridiculous issues (I'm looking at you, Witcher 2 light blobs). Otherwise CrossFired 6870's are awesome.