These look good. I've been using custom IEMs too made by Big Ear. They are pretty expensive but considering the warranty, they are worth it. Custom IEMs also help with blocking out wind noise when riding and that's why I love them.
I have a friend who used to do this. He now has a metal rod inside his thigh. He hit a car in front of him. The driver was an a-hole for brake checking him but if only my friend was focused on riding his steed then it wouldn't have had happened. The car's rear camera even recorded him texting.