Product review (2 stars): Water hammering
Causes water hammering with my high-efficiency, front-loading washer (LG). Quality craftsmanship, though.

Out of curiosity, I lowered the water pressure for the entire house down to 48 PSI (from 60 PSI), but that didn't make too much of a difference. I replaced these hoses with straight hoses that don't have an elbow (ASIN: B00UH2SZLC) and it significantly reduced the water hammering. I plan to also add some water-hammering arresters (ASIN: B000H5MQNM) for good measure, since they're only $10 and there's room for them.

I realize people buy these 90-dgree elbow hoses because they don't have a lot of space behind the washing machine. If you have a high-efficiency, front-loading washing machine, then please do everything you can to use straight hoses. Your pipes will thank you,