As a first time pet owner, I got the insurance (through VPI) so if something "big" happened, I wouldn't have to base finances as part of my decision. I chose to take that option out of the picture.
My one cat seems to be at the vet all the time (issues with his weight and a few times for anal problems.) I like feeling freer to take him as needed.
Of course the insurance doesn't cover everything, but the company mentioned is quite good with sending checks.
It's important to remember that insurance is there for the big things, when we least expect them. You may or may not get back what you put in. Hopefully, you don't get it back.....hopefully your kitty lives a healthy life.