Bought the power slinky strings for my 7 string and didn't like the loss in sustain on notes so I dropped down a gauge to these ones and haven't had any sustain issues with these, and it makes a difference having the G string coated in these compared to the plain G string in the power slinky pack
Though I bought this brand as a present for my friend, he was very happy with quality, packing and the price. So if he is saying its good, I believe him and approve Ernie Ball strings.