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The thing that gives rainbow their ability is airflow! I have heard people say before that air flow cleans, not suction. For example, I have an SE with the box style PN and it doesn't have the greatest suction, but I know it is getting my carpet clean because of the huge amount of sand and grit in the water. That airflow really helps it clean deep down. The box power nozzles have awesome airflow as well, making the original SE a PHENOMENAL vacuum. But starting with the SE performance edition with the newer style power nozzle, the airflow was choked off in the airpath behind the brushroll. It also didn't have good seals. As a further experiment to this, I used my Se with the box Power nozzle and if I lifted the front on the corner of my area rug, it lifted the whole corner of the rug up! I used the same machine with the PE nozzle and that one wouldnt even lift the rug the slightest bit. Those "performance" power nozzles were rainbows problem from the SE PE up until the E2 blue/platinum. But with the latest model, the problems have been fixed with the power nozzle, so they once again have a power nozzle that actually makes use of the machine's amazing airflow.