Yea, I used AMEX Plat., but I got Nexus + GE for both me and my wife ($50 each & AMEX reimburses $100 of charges coming from the GOES website). Getting Nexus is going to cost you $50 and AMEX won't reimburse it. Also, if you're getting Nexus and using it to enter Canada via air make sure you get the iris scan (at YYZ the Nexus office that does iris scans is on the departures level outside security - you need the iris scan to use Nexus to FLY into Canada - if you get Nexus in the US you don't need an appointment to get the iris scan at YYZ, just walk in & it takes 5 min. - the only non-airport iris scan locations are in Buffalo or Vancouver). Good luck.