In ear headphone supertest?

Hi, I am currently enjoying my goldair in ear headphones given away as part of your recent subscription, but was wondering if there are any plans on the horizon to do a test on in ear headphones to get an answer on which ones are best? I know you can now pay £500+ and get some custom fitted ones which are meant to blow anything else out of the water, but it would be interesting to read what kind of step up it makes.

Cheers!