Hi!
I've got a Giant Power PRO powermeter since 1 year ago.
In my Edge 820 I can see some data as power, balance and cadence.
Otherwise, in the Giant app RideLink I can see Effectiveness and Smootness too.
So, why doesn't my 820 show that data?
Watch GPLama's review at around 3:50 to 4:10.
The power meter does not support TE/PS over ANT+, only over its own BLE protocol