My dog and cat have been insured with Argos for years, they've always been brilliant at paying out quickly when I have needed them, and their vetphone service is great. I've recently had to cancel though because the premiums on my renewal are no longer affordable. While I understand that I have claimed twice over the years, neither claim was particularly expensive or long-term. Neither animal is particularly old for their breeds either.
Great for new customers and when making a claim, but not brilliant price-wise when you've been insured for a while.