I did buy PY to PVG for an upcoming trip. It was something like $10 more than Flex. Of course Flex is more than Tango (i.e., almost double) but I did not see Tango availability. (Perhaps my eyes did not scroll far enough left, I'm not sure.)

I want AQM so that is my reason for Flex. It's personal whether the 100% vs. 50% is worth the Flex vs Tango price, but PY (125%) for Flex price? Absolutely worth it. I slept very adequately in the window seat YVR-HKG last time. Sure, I'd love to lie flat in a pod but at E50K, I am not getting that without an objectionable co-pay. I was pleasantly surprised and relieved with the comfort factor I did have.

Meals to HKG were much better than meals to YYZ. I think I will pack snacks for the return trip this time.