I have an elder dog, who was recently diagnosed with mammary gland tumor, which had to be taken out quickly, which meant surgery. It was very stressful for all of us, and we were so glad that we had insurance for our dog, who is a member of the family.The insurance paid for most of the expenses, except for the doctor's visit, and minus the deductible. They process claims from 7-10 days, once the claim is received (it actually took about 7 days for us). I was very impressed with them, since they did what they promised.
It does not cover pre-existing conditions, but dogs and cats may get sick from something which they did not have previously, and it is really great to have it, just in case. This way you do not have to postpone any treatment, if it's needed. I have used other pet insurances in the past, and prefer this one, just because, they do not dictate, how much each treatment should be, they cover the percentage that you choose. It's great for an older dog or a cat (up to 13?, I think).