Honestly I never thought of zoom creep (it does have some) on the 15-85 as an issue. To put it as...be "forewarned" is a bit dramatic! On my copy it's very easily managed. Either keep the zoom on the short end or use tape to keep it at a focal length you desire. No drama
Perhaps forewarned was a poor choice since its an emotionally charged word. I probably should have just said, " Many examples of the 15-85 have zoom creep between around 24 and 50mm. If your copy creeps, its normal and not a defect." Better?