The German Persil liquid requires a substantially larger dose than the North American formulas, which seem to be much more concentrated, perhaps for old school toploader owners. The 2-in-1 requires a larger dose than the Original liquid and is less prone to oversudsing. (Notice the number of loads is fewer on the 2-in-1 bottle than the Original). The Original liquid is very concentrated and will oversuds if overdosed; it's amazing how little is needed. The Power Pearls definitely clean and whiten the best and truly deliver dazzling whites.
After much experimentation I've concluded Persil (all formulas) outcleans and outbrightens Tide Original HE Turbo liquid and powder, gets stains out better, and definitely rinses out easier than Tide. But proper dosing is key. JMO -- laundry seems to be highly subjective.
I wish Yankee Candle would make a Persil-scented candle. It's such an intriguing, complex scent. With an extra rinse or two, however, there is little to no scent left in laundry.
In any event, I don't see the Original scent catching on here, and it looks like Persil is going to have to offer different scents to get a foothold. Could be Persil's scent would appeal to men more than women. Most Americans seem to like simple and strong scents in the fruity and floral realm, like Gain and Tide. Or else they don't think there are any significant differences in detergents and just want something cheap like Extra or Purex.
I'd be curious to see people's opinions about color retention with Persil compared to Tide, Cheer, Gain, Woolite... I've tried Perwool regular and dark and don't think ithey're any better than Woolite formulas for cleaning or color retention.