I have been a member of NANPA for over ten years and have had their insurance product through Chubb during that time. The best part is that I have dealt with the same person the entire time and she is terrific.
I have insured all my camera gear, underwater gear (housings/ports etc.) and computers. Over that time I have made 3 or 4 claims and their response has been hassle free. If I add a new piece to my kit I email the addition and have coverage from the time of my email, even if I don't get a direct response for a day or two.