Since I started the leather dialogue(having nothing to do with kinky stuff), my precise experience was this:
In my newbie days, a couple of finger leathers were among the first critters I bought. As I learned more, I decided it was time for some lps presence on the reef. Got a beautiful hammer and a nice bubble/pearl coral. Within a week, the hammer started getting sick. Ultimately, all the soft tissue separated as the thing died.
After getting bad advice from the lfs, e.g. "That hammer was already infected", I tried another hammer. It lasted 2 weeks.
After the funeral, I was reading about genus Lobophytum in "AQUARIUM CORAL, Selection, Husbandry and Natural History" ,by Erich Borneman, RC's own guru of coral physiology. Lobophytum includes finger leather, devils hand, cabbage leather, etc. On p. 129, Dr. Borneman writes: "Many Lobophytum species can cause significant damage to stony corals without actual contact taking place. Many are considered to be in the 'most toxic' category, with more than 20 different terpenoid compounds isolated froom various species. Lobophytum pauciflorum(devils hand) is considered particulary toxic."
Was bored with leathers by then, and gave them away. Happy hammers and frogspawn to this day.
I believe all the comments about lfs living in peace and harmony with leathers. I know what works in MY reef. Ironically, I now have a ton of cabbage leather, and everybody's happy. Except I can't keep a monte cap alive to save my soul.