I have had Gibson (and Higgins) insured with Exotic Direct since I got him just over 5 years ago, and Keith (7 months) is with the, too.
If I could trust myself to save the money and not use it on other emergencies, I would! Thankfully I've never had to claim, though each time I have taken them in for checks etc. I have let the insurers know, I've just not claimed because the excess has been higher than the treatment (my excess is £65). The insurers have not marked anything as pre-existing, so the cover is still full..