I actually just got my application for mine. My new trainer is highly recommending it, so I will get it. He told me to use his agent, and if you want his name just PM me. He really was great to talk to and answered a ton of questions. Yes, you have to also carry mortality. I will have to ask him about getting their permission should he need to be PTS. I know I would probably do it regardless, and mainly have it for the medical portion. But, as was already said-they will only cover each thing once. He also doesn't deal in "loss of use" insurance, and pretty much reiterated what my opinion was of that-it is useless.
Cost wise-I will go with $7500 value on the horse-and it will be $250/yr. Only insurance I ever had on one of mine before was liability......
I have had health insurance on my dogs-which I felt was useless, in my case. Hope it is better than that. Funny, it is half the price, sort of like the vets. Equine are always cheaper.