Let me talk from experiance. I have been DL Plat for about 3 years and CO Gold for just as long. The changes were announced in December to the DL program and that was my last flight on DL. I have always liked the way CO treats their FF but was unwilling to give up the instant confirmation of first class upgrade on DL. December made up my mind in a hurry. I would hope CO doesn't give in to any pressure from teh alliance and keeps the program intact. I already have made Gold and will certanially make Plat. I have changed my alliance to CO in hopes of some stability in the program. Not to bash DL, but I for one think that was a pretty harsh business decission but it made me make the change to CO and I for one am much happier on CO.