To find out more, I bought this iron egg on Amazon.
For two weeks I boiled two kettles at once, one with the egg and one without the egg. I alternated kettles for every steep to compare the taste.
For me, adding the iron egg has been a huge success. Nearly every tea tastes "better". The iron adds roundness and body to the tea.
As for negatives, the iron seems to slightly mute high notes. It has been a pretty easy choice to make.
I have been using the egg-kettle exclusively now for nearly 2 months! Here it is when it arrived:
I busted out my original plastic kettle for this experiment. I read that it would be unwise to add this to my stainless steel kettle as it might cause it to rust.
The egg does get rusty if you don't remove it from the kettle. This hasn't bothered me much.
The egg gets HOT, so it's easy to forget it in there while it is cooling.
Here's the damage to the kettle so far, looks a little uglier:
For now I will happily continue to brew with the iron egg. In the future I will prioritize getting a tetsubin because the water makes my tea taste better.
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imgur album: https://imgur.com/a/zTcNsrj