Honestly very differantly then what im use to. I find you have to be alot more aggressive and im now rethinking over 20 years of Space Marine Warfare and equipment. I have to say I honestly do like it and I find units you didn't run before may see more action. Combat is very brutal and does favor the assaulter abit. The flow does feel right and I feel like physic power are toned down but if you do it right can be a real great boon. I also find that you get alot more unit balance and with good tactics you get a outcome you just wouldn't get before ( I killed some big nids in close combat I haven't killed since the model/rules came out). I honestly think i'll like this edition for its simplicity in rule set but with a better balance I think you'll get better tactics.