I think it depends on what you want. Remember, with AMEX Plat., the entrance is only if you're on that airline that day.

With Reserve, as far as I can tell, you can get 10k MQM, plus CRC (and only CRC) on the day you fly DL.

CRC membership -- NWA and CO clubs, free internet in DL CRC, but as a DL Gold, you should get a discount.

NWA Worldclubs -- NWA, CO, DL clubs, plus the others listed on NW website.

Also, you may want to consider Priority Pass: 99 per yr, 25 per visit (any club); 250 USD 10 visits to any clubs; 400 per yr unlimited clubs.

You get DL, CO, NWA, AA, and many US and UA clubs with Priority Pass. I thought long and hard, and finally bought PP. I don't get free internet in DL, but as I was usually in CO or NW, Ididn't care to much.

So far, I"m not sure I want to change out of PP either. Just my opinion.

Dave