The quality of the shells is not up to snuff. My right one broke after 3 months of use in normal daily usage of just inserting and taking away from my head, stored inside a soft case.
I suspect that the plastic resin used in the 3D printing is not very strong. My left IEM shell broke when inserting the tip into my ear canal, so very little force was applied.
I definitely would NOT buy these again, unless they've retooled the shell and upped the warranty to 2 years. There are just way more sturdy and proven reliable alternatives at this price range.
Don't get me wrong, I like the sound quality, but reliability for everyday use is not good enough.