We're thinking about signing up for that card too ... live in Hawaii and don't use SW to go to the mainland, though when we get there we use it to bounce between friends in Cali/
Disneyland/Az where in-laws live several times per year.
I wasn't even aware you could get to Hawaii on Southwest, must be a partner carrier thing since they don't fly here ...
Thinking about using it to get from SMF or LAX to MCO next year, at about 10,500 points per person one way it would get me and the DH there and back and we'd only have to buy DS4's tickets ... and possibly our tix to the West Coast if we haven't moved yet. I can usually find fares for $400 RT pp off-season from Maui to West Coast.
Seems like a decent deal for the fee.