Frankly speaking, I don't think this is that huge deal. Starting bonus is only 5000 (while KE gives 15000) and high annual fee... Well, I like $100 rebate part, since I can use it even through travel agency (while KE allows only website purchase, which is bookable from only gate cities, not Austin). That 10000 certificate is kind of headache to use it, if not living in Korea. Double milege is good thing if use a lot, maybe if spend $20000 per year or more. It depends.. but I would make UA/AA/NW's first year free card. And then cancel after one year. I'm also a cheap guy.

Sorry I can't help about warranty stuff.