Bits and pieces of it get used locally - nothing seems gamebreaking, though we've toned down things like Superheavies and D-Weapons locally as it is. Biggest thing I've noticed is that CSM players (myself included) are all relying really heavily on IA13 stuff to be functional at all - Rapier batteries, Sicarans and Fire Raptors go a long way towards making the army stand up.
Dear lord, D-weapons are already toned down enough!!!
I have never made but one prayer to God, a very short one: "O Lord make my enemies ridiculous." And God granted it. --Voltaire