My own experience of the Elacin plugs is that they are not worth the several thousand HKD they cost.
I tried the Elacin ear plugs a few years ago. I ended up getting a set for working and for sleeping. I found the sleeping set were too hard and rather uncomfortable. I quickly went back to the orange business class plugs. I persisted with the working set for a few months but couldn't get use to them.
For any flight where I am in the seat for longer than a few hours I use a Sennheiser PXC250 active noise cancelling headset. Very good, ... but not for line checks!