Very comfortable, but unfortunately the earphones don't fit in the charge box anymore.
I got these to use with the Fiil T1XS. They work fine, fitting the case and allowing charging without any issues. I think they're a bit too big at the end, making them less comfortable than the included small tips. I don't know if this would be possible, but would be good to get an extra small from misodiko to match the smallest included silicone tips. Sound is good and build quality looks amazing too.