I have been an American Express customer for many years, and they just offered me 90,000 Delta miles if I apply for that card they offer.  So I took it, and I'll stop using their Hilton card for a while, except when I stay at one and earn bonus points.  But will I renew the Delta card next year, when all they offer me is a free companion pass?  I guess it will depend on what the free companion looks like.  Then again, Hilton has never offered me a free companion.