Originally Posted by christep
Yes. If you fly CX a lot then the guaranteed seat at 24 hours notice at cheapest published economy (or full business) fare can be invaluable, as can being one notch higher on the priority for waitlists, upgrades etc. Also, if you are based in HK the access to the CX (business) lounges even when not flying CX is better than the BA Gold because (unless it has changed recently) the BA lounge has more limited opening hours.
Actually I'd like to add that the 24 hour guaranteed economy class seat is for ANY economy class fare. Even those unpublished ones, and those that earn no miles too. For Business Class fares, it works for J and C classes. GOLD MPO members have the seat guarantee only in economy class and it's 72 hours prior departure.