Chase is not insured. Working at a clinic, i got to see many downfalls of pet insurance (the best of the best, and your average joe). I find the insurance tries to wiggle out of claims, as i have seen countless times when i saw clients struggling to get an approval. I have only seen two approvals for major surgery (lump removal, and subluxed patellas) and it took over a month and three vets to organise.
There is a quantity limit for those people who need life long medication (insulin, thyroid meds, heart meds) once you reach that limit, you can no longer claim that medication.
Im not sure if its different in another province of canada, or a different country, but those were my experiences. I have a few connections to good vets, that if an emergency happens, they are willing to lend a helping hand. I think that, and money saved in the bank is sufficient for him.