Originally Posted by avm2806

It depends on the route you fly. The sweet spot for using a BUD is from Biz to First on LH/ULH flights. I was planning on going for 1600 but after recent announcements of removing F from refurbed 77W's and also tracking my usual route - LHR-HKG-LHR, I decided to drop the decision to go for 1600 because my preferred flight CX253/254 is downgrading to a 359 from Winter schedule. Honestly without enough F routes, the bookable upgrades have little value. Also CX really make using them a pain with online requesting, inventory / POS loopholes... it actually easier to use miles for upgrade - you can waitlist, request at airport etc.