Lori, I cannot say that I have heard of SOS, but I can answer why it might be better to get 3rd party insurance...
A few years ago the Premier Cruise Line (Big Red Boat) went banckrupt, they were served a Seize & Desist order at one of the ports of call, all the passengers were told to immediatley disembark the ship and this left them on their own to get back to the USA..the ones who bought 3rd party insurance were able to re-coup their losses, but those who had bought the cruiseline insurance, of course, lost out since the company went bankrupt, the insurance was not any good either. Sometimes it is better to purchase the 3rd party insurance, but some cruiselines make it hard for you in a case of flying and traveling and purchasing everything from them in a package, they won't help you if you do not carry their insurance, but then again, even if you did, there is no guarantee that they will help you in a travel situation such as missed flights etc....
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